- Feb 25, 2021
-
-
Dave Hansen authored
I went to go add a new RECLAIM_* mode for the zone_reclaim_mode sysctl. Like a good kernel developer, I also went to go update the documentation. I noticed that the bits in the documentation didn't match the bits in the #defines. The VM never explicitly checks the RECLAIM_ZONE bit. The bit is, however implicitly checked when checking 'node_reclaim_mode==0'. The RECLAIM_ZONE #define was removed in a cleanup. That, by itself is fine. But, when the bit was removed (bit 0) the _other_ bit locations also got changed. That's not OK because the bit values are documented to mean one specific thing. Users surely do not expect the meaning to change from kernel to kernel. The end result is that if someone had a script that did: sysctl vm.zone_reclaim_mode=1 it would have gone from enabling node reclaim for clean unmapped pages to writing out pages during node reclaim after the commit in question. That's not great. Put the bits back the way they were and add a comment so something like this is a bit harder to do again. Update the documentation to make it clear that the first bit is ignored. Link: https://lkml.kernel.org/r/20210219172555.FF0CDF23@viggo.jf.intel.com Signed-off-by:
Dave Hansen <dave.hansen@linux.intel.com> Fixes: 648b5cf3 ("mm/vmscan: remove unused RECLAIM_OFF/RECLAIM_ZONE") Reviewed-by:
Ben Widawsky <ben.widawsky@intel.com> Reviewed-by:
Oscar Salvador <osalvador@suse.de> Acked-by:
David Rientjes <rientjes@google.com> Acked-by:
Christoph Lameter <cl@linux.com> Cc: Alex Shi <alex.shi@linux.alibaba.com> Cc: Daniel Wagner <dwagner@suse.de> Cc: "Tobin C. Harding" <tobin@kernel.org> Cc: Christoph Lameter <cl@linux.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Huang Ying <ying.huang@intel.com> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Qian Cai <cai@lca.pw> Cc: <stable@vger.kernel.org> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
-
Mike Kravetz authored
Gerald Schaefer reported a panic on s390 in hugepage_subpool_put_pages() with linux-next 5.12.0-20210222. Call trace: hugepage_subpool_put_pages.part.0+0x2c/0x138 __free_huge_page+0xce/0x310 alloc_pool_huge_page+0x102/0x120 set_max_huge_pages+0x13e/0x350 hugetlb_sysctl_handler_common+0xd8/0x110 hugetlb_sysctl_handler+0x48/0x58 proc_sys_call_handler+0x138/0x238 new_sync_write+0x10e/0x198 vfs_write.part.0+0x12c/0x238 ksys_write+0x68/0xf8 do_syscall+0x82/0xd0 __do_syscall+0xb4/0xc8 system_call+0x72/0x98 This is a result of the change which moved the hugetlb page subpool pointer from page->private to page[1]->private. When new pages are allocated from the buddy allocator, the private field of the head page will be cleared, but the private field of subpages is not modified. Therefore, old values may remain. Fix by initializing hugetlb page subpool pointer in prep_new_huge_page(). Link: https://lkml.kernel.org/r/20210223215544.313871-1-mike.kravetz@oracle.com Fixes: f1280272ae4d ("hugetlb: use page.private for hugetlb specific page flags") Signed-off-by:
Mike Kravetz <mike.kravetz@oracle.com> Reported-by:
Gerald Schaefer <gerald.schaefer@linux.ibm.com> Reviewed-by:
Oscar Salvador <osalvador@suse.de> Acked-by:
Michal Hocko <mhocko@suse.com> Cc: Gerald Schaefer <gerald.schaefer@linux.ibm.com> Cc: Muchun Song <songmuchun@bytedance.com> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: Sven Schnelle <svens@linux.ibm.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
-
Mike Kravetz authored
Add comments, no functional change. Link: https://lkml.kernel.org/r/62a80585-2a73-10cc-4a2d-5721540d4ad2@oracle.com Signed-off-by:
Mike Kravetz <mike.kravetz@oracle.com> Acked-by:
Michal Hocko <mhocko@suse.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
-
Mike Kravetz authored
Use new hugetlb specific HPageFreed flag to replace the PageHugeFreed interfaces. Link: https://lkml.kernel.org/r/20210122195231.324857-6-mike.kravetz@oracle.com Signed-off-by:
Mike Kravetz <mike.kravetz@oracle.com> Reviewed-by:
Oscar Salvador <osalvador@suse.de> Reviewed-by:
Muchun Song <songmuchun@bytedance.com> Acked-by:
Michal Hocko <mhocko@suse.com> Cc: David Hildenbrand <david@redhat.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Miaohe Lin <linmiaohe@huawei.com> Cc: Michal Hocko <mhocko@kernel.org> Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
-
Mike Kravetz authored
Use new hugetlb specific HPageTemporary flag to replace the PageHugeTemporary() interfaces. PageHugeTemporary does contain a PageHuge() check. However, this interface is only used within hugetlb code where we know we are dealing with a hugetlb page. Therefore, the check can be eliminated. Link: https://lkml.kernel.org/r/20210122195231.324857-5-mike.kravetz@oracle.com Signed-off-by:
Mike Kravetz <mike.kravetz@oracle.com> Reviewed-by:
Oscar Salvador <osalvador@suse.de> Reviewed-by:
Muchun Song <songmuchun@bytedance.com> Acked-by:
Michal Hocko <mhocko@suse.com> Cc: David Hildenbrand <david@redhat.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Miaohe Lin <linmiaohe@huawei.com> Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
-
Mike Kravetz authored
Use the new hugetlb page specific flag HPageMigratable to replace the page_huge_active interfaces. By it's name, page_huge_active implied that a huge page was on the active list. However, that is not really what code checking the flag wanted to know. It really wanted to determine if the huge page could be migrated. This happens when the page is actually added to the page cache and/or task page table. This is the reasoning behind the name change. The VM_BUG_ON_PAGE() calls in the *_huge_active() interfaces are not really necessary as we KNOW the page is a hugetlb page. Therefore, they are removed. The routine page_huge_active checked for PageHeadHuge before testing the active bit. This is unnecessary in the case where we hold a reference or lock and know it is a hugetlb head page. page_huge_active is also called without holding a reference or lock (scan_movable_pages), and can race with code freeing the page. The extra check in page_huge_active shortened the race window, but did not prevent the race. Offline code calling scan_movable_pages already deals with these races, so removing the check is acceptable. Add comment to racy code. [songmuchun@bytedance.com: remove set_page_huge_active() declaration from include/linux/hugetlb.h] Link: https://lkml.kernel.org/r/CAMZfGtUda+KoAZscU0718TN61cSFwp4zy=y2oZ=+6Z2TAZZwng@mail.gmail.com Link: https://lkml.kernel.org/r/20210122195231.324857-3-mike.kravetz@oracle.com Signed-off-by:
Mike Kravetz <mike.kravetz@oracle.com> Reviewed-by:
Oscar Salvador <osalvador@suse.de> Reviewed-by:
Muchun Song <songmuchun@bytedance.com> Reviewed-by:
Miaohe Lin <linmiaohe@huawei.com> Acked-by:
Michal Hocko <mhocko@suse.com> Cc: David Hildenbrand <david@redhat.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
-
Mike Kravetz authored
Patch series "create hugetlb flags to consolidate state", v3. While discussing a series of hugetlb fixes in [1], it became evident that the hugetlb specific page state information is stored in a somewhat haphazard manner. Code dealing with state information would be easier to read, understand and maintain if this information was stored in a consistent manner. This series uses page.private of the hugetlb head page for storing a set of hugetlb specific page flags. Routines are priovided for test, set and clear of the flags. [1] https://lore.kernel.org/r/20210106084739.63318-1-songmuchun@bytedance.com This patch (of 4): As hugetlbfs evolved, state information about hugetlb pages was added. One 'convenient' way of doing this was to use available fields in tail pages. Over time, it has become difficult to know the meaning or contents of fields simply by looking at a small bit of code. Sometimes, the naming is just confusing. For example: The PagePrivate flag indicates a huge page reservation was consumed and needs to be restored if an error is encountered and the page is freed before it is instantiated. The page.private field contains the pointer to a subpool if the page is associated with one. In an effort to make the code more readable, use page.private to contain hugetlb specific page flags. These flags will have test, set and clear functions similar to those used for 'normal' page flags. More importantly, an enum of flag values will be created with names that actually reflect their purpose. In this patch, - Create infrastructure for hugetlb specific page flag functions - Move subpool pointer to page[1].private to make way for flags Create routines with meaningful names to modify subpool field - Use new HPageRestoreReserve flag instead of PagePrivate Conversion of other state information will happen in subsequent patches. Link: https://lkml.kernel.org/r/20210122195231.324857-1-mike.kravetz@oracle.com Link: https://lkml.kernel.org/r/20210122195231.324857-2-mike.kravetz@oracle.com Signed-off-by:
Mike Kravetz <mike.kravetz@oracle.com> Reviewed-by:
Oscar Salvador <osalvador@suse.de> Acked-by:
Michal Hocko <mhocko@suse.com> Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: Muchun Song <songmuchun@bytedance.com> Cc: David Hildenbrand <david@redhat.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Miaohe Lin <linmiaohe@huawei.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
-
Oscar Salvador authored
The premise of the refault distance is that it can be seen as a deficit of the inactive list space, so that if the inactive list would have had (R - E) more slots, the page would not have been evicted but promoted to the active list instead. However, the way the code is ordered right now set us to be off by one, so the real number of slots would be (R - E) + 1. I stumbled upon this when trying to understand the code and it puzzled me that the comments did not match what the code did. This it not an issue at all since evictions and refaults tend to happen in a number large enough that being off-by-one does not have any impact - and since the compiler and CPUs are free to rearrange the execution sequence anyway. But as Johannes says, it is better to re-arrange the code in the proper order since otherwise would be misleading to somebody who is actively reading and trying to understand the logic of the code - like it happened to me. Link: https://lkml.kernel.org/r/20210201060651.3781-1-osalvador@suse.de Signed-off-by:
Oscar Salvador <osalvador@suse.de> Acked-by:
Johannes Weiner <hannes@cmpxchg.org> Acked-by:
Vlastimil Babka <vbabka@suse.cz> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
-
Yu Zhao authored
All other references to the function were removed after commit b910718a ("mm: vmscan: detect file thrashing at the reclaim root"). Link: https://lore.kernel.org/linux-mm/20201207220949.830352-11-yuzhao@google.com/ Link: https://lkml.kernel.org/r/20210122220600.906146-11-yuzhao@google.com Signed-off-by:
Yu Zhao <yuzhao@google.com> Reviewed-by:
Alex Shi <alex.shi@linux.alibaba.com> Cc: Hugh Dickins <hughd@google.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Matthew Wilcox <willy@infradead.org> Cc: Michal Hocko <mhocko@kernel.org> Cc: Roman Gushchin <guro@fb.com> Cc: Vladimir Davydov <vdavydov.dev@gmail.com> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
-
Yu Zhao authored
All other references to the function were removed after commit a892cb6b ("mm/vmscan.c: use update_lru_size() in update_lru_sizes()"). Link: https://lore.kernel.org/linux-mm/20201207220949.830352-10-yuzhao@google.com/ Link: https://lkml.kernel.org/r/20210122220600.906146-10-yuzhao@google.com Signed-off-by:
Yu Zhao <yuzhao@google.com> Reviewed-by:
Alex Shi <alex.shi@linux.alibaba.com> Cc: Hugh Dickins <hughd@google.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Matthew Wilcox <willy@infradead.org> Cc: Michal Hocko <mhocko@kernel.org> Cc: Roman Gushchin <guro@fb.com> Cc: Vladimir Davydov <vdavydov.dev@gmail.com> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
-
Yu Zhao authored
We've removed all other references to this function. Link: https://lore.kernel.org/linux-mm/20201207220949.830352-9-yuzhao@google.com/ Link: https://lkml.kernel.org/r/20210122220600.906146-9-yuzhao@google.com Signed-off-by:
Yu Zhao <yuzhao@google.com> Reviewed-by:
Alex Shi <alex.shi@linux.alibaba.com> Cc: Hugh Dickins <hughd@google.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Matthew Wilcox <willy@infradead.org> Cc: Michal Hocko <mhocko@kernel.org> Cc: Roman Gushchin <guro@fb.com> Cc: Vladimir Davydov <vdavydov.dev@gmail.com> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
-
Yu Zhao authored
Move scattered VM_BUG_ONs to two essential places that cover all lru list additions and deletions. Link: https://lore.kernel.org/linux-mm/20201207220949.830352-8-yuzhao@google.com/ Link: https://lkml.kernel.org/r/20210122220600.906146-8-yuzhao@google.com Signed-off-by:
Yu Zhao <yuzhao@google.com> Cc: Alex Shi <alex.shi@linux.alibaba.com> Cc: Hugh Dickins <hughd@google.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Matthew Wilcox <willy@infradead.org> Cc: Michal Hocko <mhocko@kernel.org> Cc: Roman Gushchin <guro@fb.com> Cc: Vladimir Davydov <vdavydov.dev@gmail.com> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
-
Yu Zhao authored
Similar to page_off_lru(), the new function does non-atomic clearing of PageLRU() in addition to PageActive() and PageUnevictable(), on a page that has no references left. If PageActive() and PageUnevictable() are both set, refuse to clear either and leave them to bad_page(). This is a behavior change that is meant to help debug. Link: https://lore.kernel.org/linux-mm/20201207220949.830352-7-yuzhao@google.com/ Link: https://lkml.kernel.org/r/20210122220600.906146-7-yuzhao@google.com Signed-off-by:
Yu Zhao <yuzhao@google.com> Cc: Alex Shi <alex.shi@linux.alibaba.com> Cc: Hugh Dickins <hughd@google.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Matthew Wilcox <willy@infradead.org> Cc: Michal Hocko <mhocko@kernel.org> Cc: Roman Gushchin <guro@fb.com> Cc: Vladimir Davydov <vdavydov.dev@gmail.com> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
-
Yu Zhao authored
The parameter is redundant in the sense that it can be potentially extracted from the "struct page" parameter by page_lru(). We need to make sure that existing PageActive() or PageUnevictable() remains until the function returns. A few places don't conform, and simple reordering fixes them. This patch may have left page_off_lru() seemingly odd, and we'll take care of it in the next patch. Link: https://lore.kernel.org/linux-mm/20201207220949.830352-6-yuzhao@google.com/ Link: https://lkml.kernel.org/r/20210122220600.906146-6-yuzhao@google.com Signed-off-by:
Yu Zhao <yuzhao@google.com> Cc: Alex Shi <alex.shi@linux.alibaba.com> Cc: Hugh Dickins <hughd@google.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Matthew Wilcox <willy@infradead.org> Cc: Michal Hocko <mhocko@kernel.org> Cc: Roman Gushchin <guro@fb.com> Cc: Vladimir Davydov <vdavydov.dev@gmail.com> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
-
Yu Zhao authored
The parameter is redundant in the sense that it can be extracted from the "struct page" parameter by page_lru() correctly. Link: https://lore.kernel.org/linux-mm/20201207220949.830352-5-yuzhao@google.com/ Link: https://lkml.kernel.org/r/20210122220600.906146-5-yuzhao@google.com Signed-off-by:
Yu Zhao <yuzhao@google.com> Reviewed-by:
Alex Shi <alex.shi@linux.alibaba.com> Cc: Hugh Dickins <hughd@google.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Matthew Wilcox <willy@infradead.org> Cc: Michal Hocko <mhocko@kernel.org> Cc: Roman Gushchin <guro@fb.com> Cc: Vladimir Davydov <vdavydov.dev@gmail.com> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
-
Yu Zhao authored
The "enum lru_list" parameter to add_page_to_lru_list() and add_page_to_lru_list_tail() is redundant in the sense that it can be extracted from the "struct page" parameter by page_lru(). A caveat is that we need to make sure PageActive() or PageUnevictable() is correctly set or cleared before calling these two functions. And they are indeed. Link: https://lore.kernel.org/linux-mm/20201207220949.830352-4-yuzhao@google.com/ Link: https://lkml.kernel.org/r/20210122220600.906146-4-yuzhao@google.com Signed-off-by:
Yu Zhao <yuzhao@google.com> Cc: Alex Shi <alex.shi@linux.alibaba.com> Cc: Hugh Dickins <hughd@google.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Matthew Wilcox <willy@infradead.org> Cc: Michal Hocko <mhocko@kernel.org> Cc: Roman Gushchin <guro@fb.com> Cc: Vladimir Davydov <vdavydov.dev@gmail.com> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
-
Yu Zhao authored
These functions will call page_lru() in the following patches. Move them below page_lru() to avoid the forward declaration. Link: https://lore.kernel.org/linux-mm/20201207220949.830352-3-yuzhao@google.com/ Link: https://lkml.kernel.org/r/20210122220600.906146-3-yuzhao@google.com Signed-off-by:
Yu Zhao <yuzhao@google.com> Acked-by:
Vlastimil Babka <vbabka@suse.cz> Reviewed-by:
Miaohe Lin <linmiaohe@huawei.com> Cc: Alex Shi <alex.shi@linux.alibaba.com> Cc: Hugh Dickins <hughd@google.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Matthew Wilcox <willy@infradead.org> Cc: Michal Hocko <mhocko@kernel.org> Cc: Roman Gushchin <guro@fb.com> Cc: Vladimir Davydov <vdavydov.dev@gmail.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
-
Yu Zhao authored
Patch series "mm: lru related cleanups", v2. The cleanups are intended to reduce the verbosity in lru list operations and make them less error-prone. A typical example would be how the patches change __activate_page(): static void __activate_page(struct page *page, struct lruvec *lruvec) { if (!PageActive(page) && !PageUnevictable(page)) { - int lru = page_lru_base_type(page); int nr_pages = thp_nr_pages(page); - del_page_from_lru_list(page, lruvec, lru); + del_page_from_lru_list(page, lruvec); SetPageActive(page); - lru += LRU_ACTIVE; - add_page_to_lru_list(page, lruvec, lru); + add_page_to_lru_list(page, lruvec); trace_mm_lru_activate(page); There are a few more places like __activate_page() and they are unnecessarily repetitive in terms of figuring out which list a page should be added onto or deleted from. And with the duplicated code removed, they are easier to read, IMO. Patch 1 to 5 basically cover the above. Patch 6 and 7 make code more robust by improving bug reporting. Patch 8, 9 and 10 take care of some dangling helpers left in header files. This patch (of 10): There is add_page_to_lru_list(), and move_pages_to_lru() should reuse it, not duplicate it. Link: https://lkml.kernel.org/r/20210122220600.906146-1-yuzhao@google.com Link: https://lore.kernel.org/linux-mm/20201207220949.830352-2-yuzhao@google.com/ Link: https://lkml.kernel.org/r/20210122220600.906146-2-yuzhao@google.com Signed-off-by:
Yu Zhao <yuzhao@google.com> Reviewed-by:
Alex Shi <alex.shi@linux.alibaba.com> Acked-by:
Vlastimil Babka <vbabka@suse.cz> Reviewed-by:
Miaohe Lin <linmiaohe@huawei.com> Cc: Hugh Dickins <hughd@google.com> Cc: Michal Hocko <mhocko@kernel.org> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Vladimir Davydov <vdavydov.dev@gmail.com> Cc: Roman Gushchin <guro@fb.com> Cc: Matthew Wilcox <willy@infradead.org> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
-
Miaohe Lin authored
If list_lru_shrink_count is 0, we always return SHRINK_EMPTY regardless of the value of max_nodes. So we can return early if nodes == 0 to save some cpu cycles of approximating a reasonable limit for the nodes. Link: https://lkml.kernel.org/r/20210123073825.46709-1-linmiaohe@huawei.com Signed-off-by:
Miaohe Lin <linmiaohe@huawei.com> Reviewed-by:
Andrew Morton <akpm@linux-foundation.org> Acked-by:
Vlastimil Babka <vbabka@suse.cz> Cc: Johannes Weiner <hannes@cmpxchg.org> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
-
Alex Shi authored
The function just returns 2 results, so using a 'switch' to deal with its result is unnecessary. Also simplify it to a bool func as Vlastimil suggested. Also remove 'goto' by reusing list_move(), and take Matthew Wilcox's suggestion to update comments in function. Link: https://lkml.kernel.org/r/728874d7-2d93-4049-68c1-dcc3b2d52ccd@linux.alibaba.com Signed-off-by:
Alex Shi <alex.shi@linux.alibaba.com> Reviewed-by:
Andrew Morton <akpm@linux-foundation.org> Acked-by:
Vlastimil Babka <vbabka@suse.cz> Cc: Matthew Wilcox <willy@infradead.org> Cc: Hugh Dickins <hughd@google.com> Cc: Yu Zhao <yuzhao@google.com> Cc: Michal Hocko <mhocko@suse.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
-
Chen Wandun authored
If hugetlb_cma is enabled, it will skip boot time allocation when allocating gigantic page, that doesn't means allocation failure, so suppress this warning info. Link: https://lkml.kernel.org/r/20210219123909.13130-1-chenwandun@huawei.com Fixes: cf11e85f ("mm: hugetlb: optionally allocate gigantic hugepages using cma") Signed-off-by:
Chen Wandun <chenwandun@huawei.com> Reviewed-by:
Mike Kravetz <mike.kravetz@oracle.com> Cc: Roman Gushchin <guro@fb.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
-
Mike Kravetz authored
page structs are not guaranteed to be contiguous for gigantic pages. The routine copy_huge_page_from_user can encounter gigantic pages, yet it assumes page structs are contiguous when copying pages from user space. Since page structs for the target gigantic page are not contiguous, the data copied from user space could overwrite other pages not associated with the gigantic page and cause data corruption. Non-contiguous page structs are generally not an issue. However, they can exist with a specific kernel configuration and hotplug operations. For example: Configure the kernel with CONFIG_SPARSEMEM and !CONFIG_SPARSEMEM_VMEMMAP. Then, hotplug add memory for the area where the gigantic page will be allocated. Link: https://lkml.kernel.org/r/20210217184926.33567-2-mike.kravetz@oracle.com Fixes: 8fb5debc ("userfaultfd: hugetlbfs: add hugetlb_mcopy_atomic_pte for userfaultfd support") Signed-off-by:
Mike Kravetz <mike.kravetz@oracle.com> Cc: Zi Yan <ziy@nvidia.com> Cc: Davidlohr Bueso <dbueso@suse.de> Cc: "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Oscar Salvador <osalvador@suse.de> Cc: Joao Martins <joao.m.martins@oracle.com> Cc: <stable@vger.kernel.org> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
-
Mike Kravetz authored
page structs are not guaranteed to be contiguous for gigantic pages. The routine update_and_free_page can encounter a gigantic page, yet it assumes page structs are contiguous when setting page flags in subpages. If update_and_free_page encounters non-contiguous page structs, we can see “BUG: Bad page state in process …” errors. Non-contiguous page structs are generally not an issue. However, they can exist with a specific kernel configuration and hotplug operations. For example: Configure the kernel with CONFIG_SPARSEMEM and !CONFIG_SPARSEMEM_VMEMMAP. Then, hotplug add memory for the area where the gigantic page will be allocated. Zi Yan outlined steps to reproduce here [1]. [1] https://lore.kernel.org/linux-mm/16F7C58B-4D79-41C5-9B64-A1A1628F4AF2@nvidia.com/ Link: https://lkml.kernel.org/r/20210217184926.33567-1-mike.kravetz@oracle.com Fixes: 944d9fec ("hugetlb: add support for gigantic page allocation at runtime") Signed-off-by:
Zi Yan <ziy@nvidia.com> Signed-off-by:
Mike Kravetz <mike.kravetz@oracle.com> Cc: Zi Yan <ziy@nvidia.com> Cc: Davidlohr Bueso <dbueso@suse.de> Cc: "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Oscar Salvador <osalvador@suse.de> Cc: Joao Martins <joao.m.martins@oracle.com> Cc: <stable@vger.kernel.org> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
-
Miaohe Lin authored
We can use helper huge_page_size() to get the hugepage size directly to simplify the code slightly. [linmiaohe@huawei.com: use helper huge_page_size() to get hugepage size] Link: https://lkml.kernel.org/r/20210209021803.49211-1-linmiaohe@huawei.com Link: https://lkml.kernel.org/r/20210208082450.15716-1-linmiaohe@huawei.com Signed-off-by:
Miaohe Lin <linmiaohe@huawei.com> Reviewed-by:
Mike Kravetz <mike.kravetz@oracle.com> Reviewed-by:
David Hildenbrand <david@redhat.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
-
Miaohe Lin authored
All callers know they are operating on a hugetlb head page. So this VM_BUG_ON_PAGE can not catch anything useful. Link: https://lkml.kernel.org/r/20210209071151.44731-1-linmiaohe@huawei.com Signed-off-by:
Miaohe Lin <linmiaohe@huawei.com> Reviewed-by:
Oscar Salvador <osalvador@suse.de> Cc: Mike Kravetz <mike.kravetz@oracle.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
-
Miaohe Lin authored
We could use helper function range_in_vma() to check whether the vma is in the desired range to simplify the code. Link: https://lkml.kernel.org/r/20210204112949.43051-1-linmiaohe@huawei.com Signed-off-by:
Miaohe Lin <linmiaohe@huawei.com> Reviewed-by:
Mike Kravetz <mike.kravetz@oracle.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
-
Miaohe Lin authored
We could use helper function pages_per_huge_page() to get the number of pages in a hstate to simplify the code slightly. Link: https://lkml.kernel.org/r/20210205084513.29624-1-linmiaohe@huawei.com Signed-off-by:
Miaohe Lin <linmiaohe@huawei.com> Reviewed-by:
David Hildenbrand <david@redhat.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
-
Aneesh Kumar K.V authored
Differentiate between hardware not supporting hugepages and user disabling THP via 'echo never > /sys/kernel/mm/transparent_hugepage/enabled' For the devdax namespace, the kernel handles the above via the supported_alignment attribute and failing to initialize the namespace if the namespace align value is not supported on the platform. For the fsdax namespace, the kernel will continue to initialize the namespace. This can result in the kernel creating a huge pte entry even though the hardware don't support the same. We do want hugepage support with pmem even if the end-user disabled THP via sysfs file (/sys/kernel/mm/transparent_hugepage/enabled). Hence differentiate between hardware/firmware lacking support vs user-controlled disable of THP and prevent a huge fault if the hardware lacks hugepage support. Link: https://lkml.kernel.org/r/20210205023956.417587-1-aneesh.kumar@linux.ibm.com Signed-off-by:
Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Reviewed-by:
Dan Williams <dan.j.williams@intel.com> Cc: "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com> Cc: Jan Kara <jack@suse.cz> Cc: David Hildenbrand <david@redhat.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
-
Miaohe Lin authored
The return value of set_huge_zero_page() is always ignored. So we should drop such return value. Link: https://lkml.kernel.org/r/20210203084816.46307-1-linmiaohe@huawei.com Signed-off-by:
Miaohe Lin <linmiaohe@huawei.com> Cc: Mike Kravetz <mike.kravetz@oracle.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
-
Zhiyuan Dai authored
Fix typo in comment. Link: https://lkml.kernel.org/r/1612256106-9436-1-git-send-email-daizhiyuan@phytium.com.cn Signed-off-by:
Zhiyuan Dai <daizhiyuan@phytium.com.cn> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
-
Yanfei Xu authored
Gigantic page is a compound page and its order is more than 1. Thus it must be available for hpage_pincount. Let's remove the redundant check for gigantic page. Link: https://lkml.kernel.org/r/20210202112002.73170-1-yanfei.xu@windriver.com Signed-off-by:
Yanfei Xu <yanfei.xu@windriver.com> Reviewed-by:
Mike Kravetz <mike.kravetz@oracle.com> Reviewed-by:
David Hildenbrand <david@redhat.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
-
Miaohe Lin authored
Fix typos sasitfy to satisfy, reservtion to reservation, hugegpage to hugepage and uniprocesor to uniprocessor in comments. Link: https://lkml.kernel.org/r/20210128112028.64831-1-linmiaohe@huawei.com Signed-off-by:
Miaohe Lin <linmiaohe@huawei.com> Reviewed-by:
Souptick Joarder <jrdr.linux@gmail.com> Cc: Mike Kravetz <mike.kravetz@oracle.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
-
Joao Martins authored
For a given hugepage backing a VA, there's a rather ineficient loop which is solely responsible for storing subpages in GUP @pages/@vmas array. For each subpage we check whether it's within range or size of @pages and keep increment @pfn_offset and a couple other variables per subpage iteration. Simplify this logic and minimize the cost of each iteration to just store the output page/vma. Instead of incrementing number of @refs iteratively, we do it through pre-calculation of @refs and only with a tight loop for storing pinned subpages/vmas. Additionally, retain existing behaviour with using mem_map_offset() when recording the subpages for configurations that don't have a contiguous mem_map. pinning consequently improves bringing us close to {pin,get}_user_pages_fast: - 16G with 1G huge page size gup_test -f /mnt/huge/file -m 16384 -r 30 -L -S -n 512 -w PIN_LONGTERM_BENCHMARK: ~12.8k us -> ~5.8k us PIN_FAST_BENCHMARK: ~3.7k us Link: https://lkml.kernel.org/r/20210128182632.24562-3-joao.m.martins@oracle.com Signed-off-by:
Joao Martins <joao.m.martins@oracle.com> Reviewed-by:
Mike Kravetz <mike.kravetz@oracle.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
-
Joao Martins authored
Patch series "mm/hugetlb: follow_hugetlb_page() improvements", v2. While looking at ZONE_DEVICE struct page reuse particularly the last patch[0], I found two possible improvements for follow_hugetlb_page() which is solely used for get_user_pages()/pin_user_pages(). The first patch batches page refcount updates while the second tidies up storing the subpages/vmas. Both together bring the cost of slow variant of gup() cost from ~87.6k usecs to ~5.8k usecs. libhugetlbfs tests seem to pass as well gup_test benchmarks with hugetlbfs vmas. This patch (of 2): follow_hugetlb_page() once it locks the pmd/pud, checks all its N subpages in a huge page and grabs a reference for each one. Similar to gup-fast, have follow_hugetlb_page() grab the head page refcount only after counting all its subpages that are part of the just faulted huge page. Consequently we reduce the number of atomics necessary to pin said huge page, which improves non-fast gup() considerably: - 16G with 1G huge page size gup_test -f /mnt/huge/file -m 16384 -r 10 -L -S -n 512 -w PIN_LONGTERM_BENCHMARK: ~87.6k us -> ~12.8k us Link: https://lkml.kernel.org/r/20210128182632.24562-1-joao.m.martins@oracle.com Link: https://lkml.kernel.org/r/20210128182632.24562-2-joao.m.martins@oracle.com Signed-off-by:
Joao Martins <joao.m.martins@oracle.com> Reviewed-by:
Mike Kravetz <mike.kravetz@oracle.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
-
Jiapeng Zhong authored
Fix the following coccicheck warnings: mm/hugetlb.c:3372:20-22: WARNING !A || A && B is equivalent to !A || B. Link: https://lkml.kernel.org/r/1611643468-52233-1-git-send-email-abaci-bugfix@linux.alibaba.com Signed-off-by:
Jiapeng Zhong <abaci-bugfix@linux.alibaba.com> Reported-by:
Abaci Robot <abaci@linux.alibaba.com> Reviewed-by:
Miaohe Lin <linmiaohe@huawei.com> Reviewed-by:
Mike Kravetz <mike.kravetz@oracle.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
-
Miaohe Lin authored
If a hugetlbfs filesystem is created with the min_size option and without the size option, used_hpages is always 0 and might lead to release subpool prematurely because it indicates no pages are used now while there might be. In order to fix this issue, we should check used_hpages == 0 iff max_hpages accounting is enabled. As max_hpages accounting should be enabled in most common case, this is not worth a Cc stable. [mike.kravetz@oracle.com: new changelog] Link: https://lkml.kernel.org/r/20210126115510.53374-1-linmiaohe@huawei.com Signed-off-by:
Hongxiang Lou <louhongxiang@huawei.com> Signed-off-by:
Miaohe Lin <linmiaohe@huawei.com> Reviewed-by:
Mike Kravetz <mike.kravetz@oracle.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
-
Miaohe Lin authored
Since commit a5516438 ("hugetlb: modular state for hugetlb page size"), we can use huge_page_order to access hstate->order and pages_per_huge_page to fetch the pages per huge page. But gather_bootmem_prealloc() forgot to use it. Link: https://lkml.kernel.org/r/20210114114435.40075-1-linmiaohe@huawei.com Signed-off-by:
Miaohe Lin <linmiaohe@huawei.com> Reviewed-by:
David Hildenbrand <david@redhat.com> Reviewed-by:
Mike Kravetz <mike.kravetz@oracle.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
-
Miaohe Lin authored
When reservation accounting remains unchanged, hugetlb_acct_memory() will do nothing except holding and releasing hugetlb_lock. We should avoid this unnecessary hugetlb_lock lock/unlock cycle which is happening on 'most' hugetlb munmap operations by check delta against 0 at the beginning of hugetlb_acct_memory. Link: https://lkml.kernel.org/r/20210115092013.61012-1-linmiaohe@huawei.com Signed-off-by:
Miaohe Lin <linmiaohe@huawei.com> Reviewed-by:
David Hildenbrand <david@redhat.com> Reviewed-by:
Oscar Salvador <osalvador@suse.de> Cc: Mike Kravetz <mike.kravetz@oracle.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
-
Li Xinhai authored
The current code would unnecessarily expand the address range. Consider one example, (start, end) = (1G-2M, 3G+2M), and (vm_start, vm_end) = (1G-4M, 3G+4M), the expected adjustment should be keep (1G-2M, 3G+2M) without expand. But the current result will be (1G-4M, 3G+4M). Actually, the range (1G-4M, 1G) and (3G, 3G+4M) would never been involved in pmd sharing. After this patch, we will check that the vma span at least one PUD aligned size and the start,end range overlap the aligned range of vma. With above example, the aligned vma range is (1G, 3G), so if (start, end) range is within (1G-4M, 1G), or within (3G, 3G+4M), then no adjustment to both start and end. Otherwise, we will have chance to adjust start downwards or end upwards without exceeding (vm_start, vm_end). Mike: : The 'adjusted range' is used for calls to mmu notifiers and cache(tlb) : flushing. Since the current code unnecessarily expands the range in some : cases, more entries than necessary would be flushed. This would/could : result in performance degradation. However, this is highly dependent on : the user runtime. Is there a combination of vma layout and calls to : actually hit this issue? If the issue is hit, will those entries : unnecessarily flushed be used again and need to be unnecessarily reloaded? Link: https://lkml.kernel.org/r/20210104081631.2921415-1-lixinhai.lxh@gmail.com Fixes: 75802ca6 ("mm/hugetlb: fix calculation of adjust_range_if_pmd_sharing_possible") Signed-off-by:
Li Xinhai <lixinhai.lxh@gmail.com> Suggested-by:
Mike Kravetz <mike.kravetz@oracle.com> Reviewed-by:
Mike Kravetz <mike.kravetz@oracle.com> Cc: Peter Xu <peterx@redhat.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
-
Miaohe Lin authored
In hugetlb_sysfs_add_hstate(), we would do kobject_put() on hstate_kobjs when failed to create sysfs group but forget to set hstate_kobjs to NULL. Then in hugetlb_register_node() error path, we may free it again via hugetlb_unregister_node(). Link: https://lkml.kernel.org/r/20210107123249.36964-1-linmiaohe@huawei.com Fixes: a3437870 ("hugetlb: new sysfs interface") Signed-off-by:
Miaohe Lin <linmiaohe@huawei.com> Reviewed-by:
Mike Kravetz <mike.kravetz@oracle.com> Reviewed-by:
Muchun Song <smuchun@gmail.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
-