On Tue, 28 Feb 2012 22:00:24 +0800
Fengguang Wu <fengguang.wu@xxxxxxxxx> wrote:
> From: Greg Thelen <gthelen@xxxxxxxxxx>
>
> Add memcg routines to count dirty, writeback, and unstable_NFS pages.
> These routines are not yet used by the kernel to count such pages. A
> later change adds kernel calls to these new routines.
>
> As inode pages are marked dirty, if the dirtied page's cgroup differs
> from the inode's cgroup, then mark the inode shared across several
> cgroup.
>
> ...
>
> @@ -1885,6 +1888,44 @@ void mem_cgroup_update_page_stat(struct
> ClearPageCgroupFileMapped(pc);
> idx = MEM_CGROUP_STAT_FILE_MAPPED;
> break;
> +
> + case MEMCG_NR_FILE_DIRTY:
> + /* Use Test{Set,Clear} to only un/charge the memcg once. */
> + if (val > 0) {
> + if (TestSetPageCgroupFileDirty(pc))
> + val = 0;
> + } else {
> + if (!TestClearPageCgroupFileDirty(pc))
> + val = 0;
> + }
Made me scratch my head for a while, but I see now that the `val' arg
to (the undocumented) mem_cgroup_update_page_stat() can only ever have
the values 1 or -1. I hope.
>
> ...
>
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