Documentation: filesystems: proc: update meminfo section
Patch series "zswap: accounting & cgroup control", v2. Zswap can consume nearly a quarter of RAM in the default configuration, yet it's neither listed in /proc/meminfo, nor is it accounted and manageable on a per-cgroup basis. This makes reasoning about the memory situation on a host in general rather difficult. On shared/cgrouped hosts, the consequences are worse. First, workloads can escape memory containment and cause resource priority inversions: a lo-pri group can fill the global zswap pool and force a hi-pri group out to disk. Second, not all workloads benefit from zswap equally. Some even suffer when memory contents compress poorly, and are better off going to disk swap directly. On a host with mixed workloads, it's currently not possible to enable zswap for one workload but not for the other. This series implements the missing global accounting as well as cgroup tracking & control for zswap backing memory: - Patch 1 refreshes the very out-of-date meminfo documentation in Documentation/filesystems/proc.rst. - Patches 2-4 clean up related and adjacent options in Kconfig. Not actual dependencies, just things I noticed during development. - Patch 5 adds meminfo and vmstat coverage for zswap consumption and activity. - Patch 6 implements per-cgroup tracking & control of zswap memory. This patch (of 6): Add new entries. Minor corrections and cleanups. [hannes@cmpxchg.org: fix htmldocs warnings] Link: https://lkml.kernel.org/r/Ynve8dg4zJyhH2gW@cmpxchg.org [hannes@cmpxchg.org: change `Unevictable' wording, per David] Link: https://lkml.kernel.org/r/YnwFraZlVWQoCjz3@cmpxchg.org Link: https://lkml.kernel.org/r/20220510152847.230957-1-hannes@cmpxchg.org Link: https://lkml.kernel.org/r/20220510152847.230957-2-hannes@cmpxchg.org Signed-off-by:Johannes Weiner <hannes@cmpxchg.org> Acked-by:
David Hildenbrand <david@redhat.com> Cc: Dan Streetman <ddstreet@ieee.org> Cc: Michal Hocko <mhocko@suse.com> Cc: Minchan Kim <minchan@kernel.org> Cc: Roman Gushchin <guro@fb.com> Cc: Seth Jennings <sjenning@redhat.com> Cc: Shakeel Butt <shakeelb@google.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org>
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