Commit 9cc7e96a authored by Liam Mark's avatar Liam Mark Committed by Linus Torvalds
Browse files

mm/page_owner: record timestamp and pid 

Collect the time for each allocation recorded in page owner so that
allocation "surges" can be measured.

Record the pid for each allocation recorded in page owner so that the
source of allocation "surges" can be better identified.

The above is very useful when doing memory analysis.  On a crash for
example, we can get this information from kdump (or ramdump) and parse it
to figure out memory allocation problems.

Please note that on x86_64 this increases the size of struct page_owner
from 16 bytes to 32.

Vlastimil: it's not a functionality intended for production, so unless
somebody says they need to enable page_owner for debugging and this
increase prevents them from fitting into available memory, let's not
complicate things with making this optional.

[lmark@codeaurora.org: v3]
  Link: https://lkml.kernel.org/r/20201210160357.27779-1-georgi.djakov@linaro.org

Link: https://lkml.kernel.org/r/20201209125153.10533-1-georgi.djakov@linaro.org


Signed-off-by: default avatarLiam Mark <lmark@codeaurora.org>
Signed-off-by: default avatarGeorgi Djakov <georgi.djakov@linaro.org>
Acked-by: default avatarVlastimil Babka <vbabka@suse.cz>
Acked-by: default avatarJoonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 7fb7ab6d

Documentation/vm/page_owner.rst

+6 −6
Original line number Diff line number Diff line
@@ -41,17 +41,17 @@ size change due to this facility. 
- Without page owner::



   text    data     bss     dec     hex filename

   40662   1493     644   42799    a72f mm/page_alloc.o

   48392   2333     644   51369    c8a9 mm/page_alloc.o



- With page owner::



   text    data     bss     dec     hex filename

   40892   1493     644   43029    a815 mm/page_alloc.o

   1427      24       8    1459     5b3 mm/page_ext.o

   2722      50       0    2772     ad4 mm/page_owner.o

   48800   2445     644   51889    cab1 mm/page_alloc.o

   6574     108      29    6711    1a37 mm/page_owner.o

   1025       8       8    1041     411 mm/page_ext.o



Although, roughly, 4 KB code is added in total, page_alloc.o increase by

230 bytes and only half of it is in hotpath. Building the kernel with

Although, roughly, 8 KB code is added in total, page_alloc.o increase by

520 bytes and less than half of it is in hotpath. Building the kernel with

page owner and turning it on if needed would be great option to debug

kernel memory problem.

mm/page_owner.c

+13 −4
Original line number Diff line number Diff line
@@ -10,6 +10,7 @@ 
#include <linux/migrate.h>

#include <linux/stackdepot.h>

#include <linux/seq_file.h>

#include <linux/sched/clock.h>



#include "internal.h"
@@ -25,6 +26,8 @@ struct page_owner { 
	gfp_t gfp_mask;

	depot_stack_handle_t handle;

	depot_stack_handle_t free_handle;

	u64 ts_nsec;

	pid_t pid;

};



static bool page_owner_enabled = false;
@@ -172,6 +175,8 @@ static inline void __set_page_owner_handle(struct page *page, 
		page_owner->order = order;

		page_owner->gfp_mask = gfp_mask;

		page_owner->last_migrate_reason = -1;

		page_owner->pid = current->pid;

		page_owner->ts_nsec = local_clock();

		__set_bit(PAGE_EXT_OWNER, &page_ext->flags);

		__set_bit(PAGE_EXT_OWNER_ALLOCATED, &page_ext->flags);
@@ -236,6 +241,8 @@ void __copy_page_owner(struct page *oldpage, struct page *newpage) 
	new_page_owner->last_migrate_reason =

		old_page_owner->last_migrate_reason;

	new_page_owner->handle = old_page_owner->handle;

	new_page_owner->pid = old_page_owner->pid;

	new_page_owner->ts_nsec = old_page_owner->ts_nsec;



	/*

	 * We don't clear the bit on the oldpage as it's going to be freed
@@ -349,9 +356,10 @@ print_page_owner(char __user *buf, size_t count, unsigned long pfn, 
		return -ENOMEM;



	ret = snprintf(kbuf, count,

			"Page allocated via order %u, mask %#x(%pGg)\n",

			"Page allocated via order %u, mask %#x(%pGg), pid %d, ts %llu ns\n",

			page_owner->order, page_owner->gfp_mask,

			&page_owner->gfp_mask);

			&page_owner->gfp_mask, page_owner->pid,

			page_owner->ts_nsec);



	if (ret >= count)

		goto err;
@@ -427,8 +435,9 @@ void __dump_page_owner(struct page *page) 
	else

		pr_alert("page_owner tracks the page as freed\n");



	pr_alert("page last allocated via order %u, migratetype %s, gfp_mask %#x(%pGg)\n",

		 page_owner->order, migratetype_names[mt], gfp_mask, &gfp_mask);

	pr_alert("page last allocated via order %u, migratetype %s, gfp_mask %#x(%pGg), pid %d, ts %llu\n",

		 page_owner->order, migratetype_names[mt], gfp_mask, &gfp_mask,

		 page_owner->pid, page_owner->ts_nsec);



	handle = READ_ONCE(page_owner->handle);

	if (!handle) {