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e3a9ac4e86
Kernel file pages are tricky to track because they are indistinguishable from files whose usage is accounted to the root cgroup. To maintain good accounting, introduce a vmstat counter tracking kernel file pages. Confirmed that these work as expected at a high level by mounting a btrfs using AS_KERNEL_FILE for metadata pages, and seeing the counter rise with fs usage then go back to a minimal level after drop_caches and finally down to 0 after unmounting the fs. Link: https://lkml.kernel.org/r/08ff633e3a005ed5f7691bfd9f58a5df8e474339.1755812945.git.boris@bur.io Signed-off-by: Boris Burkov <boris@bur.io> Suggested-by: Shakeel Butt <shakeel.butt@linux.dev> Acked-by: Shakeel Butt <shakeel.butt@linux.dev> Tested-by: syzbot@syzkaller.appspotmail.com Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Michal Hocko <mhocko@kernel.org> Cc: Muchun Song <muchun.song@linux.dev> Cc: Qu Wenruo <wqu@suse.com> Cc: Roman Gushchin <roman.gushchin@linux.dev> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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