* Andrea Righi <arighi@xxxxxxxxxxx> [2010-03-04 11:40:13]:
> Introduce page_cgroup flags to keep track of file cache pages.
>
> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
> Signed-off-by: Andrea Righi <arighi@xxxxxxxxxxx>
> ---
Looks good
Acked-by: Balbir Singh <balbir@xxxxxxxxxxxxxxxxxx>
> include/linux/page_cgroup.h | 49 +++++++++++++++++++++++++++++++++++++++++++
> 1 files changed, 49 insertions(+), 0 deletions(-)
>
> diff --git a/include/linux/page_cgroup.h b/include/linux/page_cgroup.h
> index 30b0813..1b79ded 100644
> --- a/include/linux/page_cgroup.h
> +++ b/include/linux/page_cgroup.h
> @@ -39,6 +39,12 @@ enum {
> PCG_CACHE, /* charged as cache */
> PCG_USED, /* this object is in use. */
> PCG_ACCT_LRU, /* page has been accounted for */
> + PCG_MIGRATE_LOCK, /* used for mutual execution of account migration */
> + PCG_ACCT_FILE_MAPPED, /* page is accounted as file rss*/
> + PCG_ACCT_DIRTY, /* page is dirty */
> + PCG_ACCT_WRITEBACK, /* page is being written back to disk */
> + PCG_ACCT_WRITEBACK_TEMP, /* page is used as temporary buffer for FUSE */
> + PCG_ACCT_UNSTABLE_NFS, /* NFS page not yet committed to the server */
> };
>
> #define TESTPCGFLAG(uname, lname) \
> @@ -73,6 +79,27 @@ CLEARPCGFLAG(AcctLRU, ACCT_LRU)
> TESTPCGFLAG(AcctLRU, ACCT_LRU)
> TESTCLEARPCGFLAG(AcctLRU, ACCT_LRU)
>
> +/* File cache and dirty memory flags */
> +TESTPCGFLAG(FileMapped, ACCT_FILE_MAPPED)
> +SETPCGFLAG(FileMapped, ACCT_FILE_MAPPED)
> +CLEARPCGFLAG(FileMapped, ACCT_FILE_MAPPED)
> +
> +TESTPCGFLAG(Dirty, ACCT_DIRTY)
> +SETPCGFLAG(Dirty, ACCT_DIRTY)
> +CLEARPCGFLAG(Dirty, ACCT_DIRTY)
> +
> +TESTPCGFLAG(Writeback, ACCT_WRITEBACK)
> +SETPCGFLAG(Writeback, ACCT_WRITEBACK)
> +CLEARPCGFLAG(Writeback, ACCT_WRITEBACK)
> +
> +TESTPCGFLAG(WritebackTemp, ACCT_WRITEBACK_TEMP)
> +SETPCGFLAG(WritebackTemp, ACCT_WRITEBACK_TEMP)
> +CLEARPCGFLAG(WritebackTemp, ACCT_WRITEBACK_TEMP)
> +
> +TESTPCGFLAG(UnstableNFS, ACCT_UNSTABLE_NFS)
> +SETPCGFLAG(UnstableNFS, ACCT_UNSTABLE_NFS)
> +CLEARPCGFLAG(UnstableNFS, ACCT_UNSTABLE_NFS)
> +
> static inline int page_cgroup_nid(struct page_cgroup *pc)
> {
> return page_to_nid(pc->page);
> @@ -83,6 +110,9 @@ static inline enum zone_type page_cgroup_zid(struct page_cgroup *pc)
> return page_zonenum(pc->page);
> }
>
> +/*
> + * lock_page_cgroup() should not be held under mapping->tree_lock
> + */
May be a DEBUG WARN_ON would be appropriate here?
> static inline void lock_page_cgroup(struct page_cgroup *pc)
> {
> bit_spin_lock(PCG_LOCK, &pc->flags);
> @@ -93,6 +123,25 @@ static inline void unlock_page_cgroup(struct page_cgroup *pc)
> bit_spin_unlock(PCG_LOCK, &pc->flags);
> }
>
> +/*
> + * Lock order is
> + * lock_page_cgroup()
> + * lock_page_cgroup_migrate()
> + *
> + * This lock is not be lock for charge/uncharge but for account moving.
> + * i.e. overwrite pc->mem_cgroup. The lock owner should guarantee by itself
> + * the page is uncharged while we hold this.
> + */
> +static inline void lock_page_cgroup_migrate(struct page_cgroup *pc)
> +{
> + bit_spin_lock(PCG_MIGRATE_LOCK, &pc->flags);
> +}
> +
> +static inline void unlock_page_cgroup_migrate(struct page_cgroup *pc)
> +{
> + bit_spin_unlock(PCG_MIGRATE_LOCK, &pc->flags);
> +}
> +
> #else /* CONFIG_CGROUP_MEM_RES_CTLR */
> struct page_cgroup;
>
> --
> 1.6.3.3
>
--
Three Cheers,
Balbir
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