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    SubjectRe: [PATCH -mmotm 3/4] memcg: dirty pages accounting and limiting infrastructure
    From
    On Thu, Mar 4, 2010 at 12:40 PM, Andrea Righi <arighi@develer.com> wrote:
    > Infrastructure to account dirty pages per cgroup and add dirty limit
    > interfaces in the cgroupfs:
    >
    >  - Direct write-out: memory.dirty_ratio, memory.dirty_bytes
    >
    >  - Background write-out: memory.dirty_background_ratio, memory.dirty_background_bytes
    >
    > Signed-off-by: Andrea Righi <arighi@develer.com>
    > ---
    >  include/linux/memcontrol.h |   80 ++++++++-
    >  mm/memcontrol.c            |  420 +++++++++++++++++++++++++++++++++++++++-----
    >  2 files changed, 450 insertions(+), 50 deletions(-)
    >
    > diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
    > index 1f9b119..cc3421b 100644
    > --- a/include/linux/memcontrol.h
    > +++ b/include/linux/memcontrol.h
    > @@ -19,12 +19,66 @@
    >
    >  #ifndef _LINUX_MEMCONTROL_H
    >  #define _LINUX_MEMCONTROL_H
    > +
    > +#include <linux/writeback.h>
    >  #include <linux/cgroup.h>
    > +
    >  struct mem_cgroup;
    >  struct page_cgroup;
    >  struct page;
    >  struct mm_struct;
    >
    > +/* Cgroup memory statistics items exported to the kernel */
    > +enum mem_cgroup_page_stat_item {
    > +       MEMCG_NR_DIRTYABLE_PAGES,
    > +       MEMCG_NR_RECLAIM_PAGES,
    > +       MEMCG_NR_WRITEBACK,
    > +       MEMCG_NR_DIRTY_WRITEBACK_PAGES,
    > +};
    > +
    > +/* Dirty memory parameters */
    > +struct dirty_param {
    > +       int dirty_ratio;
    > +       unsigned long dirty_bytes;
    > +       int dirty_background_ratio;
    > +       unsigned long dirty_background_bytes;
    > +};
    > +
    > +/*
    > + * Statistics for memory cgroup.
    > + */
    > +enum mem_cgroup_stat_index {
    > +       /*
    > +        * For MEM_CONTAINER_TYPE_ALL, usage = pagecache + rss.
    > +        */
    > +       MEM_CGROUP_STAT_CACHE,     /* # of pages charged as cache */
    > +       MEM_CGROUP_STAT_RSS,       /* # of pages charged as anon rss */
    > +       MEM_CGROUP_STAT_FILE_MAPPED,  /* # of pages charged as file rss */
    > +       MEM_CGROUP_STAT_PGPGIN_COUNT,   /* # of pages paged in */
    > +       MEM_CGROUP_STAT_PGPGOUT_COUNT,  /* # of pages paged out */
    > +       MEM_CGROUP_STAT_SWAPOUT, /* # of pages, swapped out */
    > +       MEM_CGROUP_EVENTS,      /* incremented at every  pagein/pageout */
    > +       MEM_CGROUP_STAT_FILE_DIRTY,   /* # of dirty pages in page cache */
    > +       MEM_CGROUP_STAT_WRITEBACK,   /* # of pages under writeback */
    > +       MEM_CGROUP_STAT_WRITEBACK_TEMP,   /* # of pages under writeback using
    > +                                               temporary buffers */
    > +       MEM_CGROUP_STAT_UNSTABLE_NFS,   /* # of NFS unstable pages */
    > +
    > +       MEM_CGROUP_STAT_NSTATS,
    > +};
    > +
    > +/*
    > + * TODO: provide a validation check routine. And retry if validation
    > + * fails.
    > + */
    > +static inline void get_global_dirty_param(struct dirty_param *param)
    > +{
    > +       param->dirty_ratio = vm_dirty_ratio;
    > +       param->dirty_bytes = vm_dirty_bytes;
    > +       param->dirty_background_ratio = dirty_background_ratio;
    > +       param->dirty_background_bytes = dirty_background_bytes;
    > +}
    > +
    >  #ifdef CONFIG_CGROUP_MEM_RES_CTLR
    >  /*
    >  * All "charge" functions with gfp_mask should use GFP_KERNEL or
    > @@ -117,6 +171,10 @@ extern void mem_cgroup_print_oom_info(struct mem_cgroup *memcg,
    >  extern int do_swap_account;
    >  #endif
    >
    > +extern bool mem_cgroup_has_dirty_limit(void);
    > +extern void get_dirty_param(struct dirty_param *param);
    > +extern s64 mem_cgroup_page_stat(enum mem_cgroup_page_stat_item item);
    > +
    >  static inline bool mem_cgroup_disabled(void)
    >  {
    >        if (mem_cgroup_subsys.disabled)
    > @@ -125,7 +183,8 @@ static inline bool mem_cgroup_disabled(void)
    >  }
    >
    >  extern bool mem_cgroup_oom_called(struct task_struct *task);
    > -void mem_cgroup_update_file_mapped(struct page *page, int val);
    > +void mem_cgroup_update_stat(struct page *page,
    > +                       enum mem_cgroup_stat_index idx, int val);
    >  unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
    >                                                gfp_t gfp_mask, int nid,
    >                                                int zid);
    > @@ -300,8 +359,8 @@ mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
    >  {
    >  }
    >
    > -static inline void mem_cgroup_update_file_mapped(struct page *page,
    > -                                                       int val)
    > +static inline void mem_cgroup_update_stat(struct page *page,
    > +                       enum mem_cgroup_stat_index idx, int val)
    >  {
    >  }
    >
    > @@ -312,6 +371,21 @@ unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
    >        return 0;
    >  }
    >
    > +static inline bool mem_cgroup_has_dirty_limit(void)
    > +{
    > +       return false;
    > +}
    > +
    > +static inline void get_dirty_param(struct dirty_param *param)
    > +{
    > +       get_global_dirty_param(param);
    > +}
    > +
    > +static inline s64 mem_cgroup_page_stat(enum mem_cgroup_page_stat_item item)
    > +{
    > +       return -ENOSYS;
    > +}
    > +
    >  #endif /* CONFIG_CGROUP_MEM_CONT */
    >
    >  #endif /* _LINUX_MEMCONTROL_H */
    > diff --git a/mm/memcontrol.c b/mm/memcontrol.c
    > index 497b6f7..9842e7b 100644
    > --- a/mm/memcontrol.c
    > +++ b/mm/memcontrol.c
    > @@ -73,28 +73,23 @@ static int really_do_swap_account __initdata = 1; /* for remember boot option*/
    >  #define THRESHOLDS_EVENTS_THRESH (7) /* once in 128 */
    >  #define SOFTLIMIT_EVENTS_THRESH (10) /* once in 1024 */
    >
    > -/*
    > - * Statistics for memory cgroup.
    > - */
    > -enum mem_cgroup_stat_index {
    > -       /*
    > -        * For MEM_CONTAINER_TYPE_ALL, usage = pagecache + rss.
    > -        */
    > -       MEM_CGROUP_STAT_CACHE,     /* # of pages charged as cache */
    > -       MEM_CGROUP_STAT_RSS,       /* # of pages charged as anon rss */
    > -       MEM_CGROUP_STAT_FILE_MAPPED,  /* # of pages charged as file rss */
    > -       MEM_CGROUP_STAT_PGPGIN_COUNT,   /* # of pages paged in */
    > -       MEM_CGROUP_STAT_PGPGOUT_COUNT,  /* # of pages paged out */
    > -       MEM_CGROUP_STAT_SWAPOUT, /* # of pages, swapped out */
    > -       MEM_CGROUP_EVENTS,      /* incremented at every  pagein/pageout */
    > -
    > -       MEM_CGROUP_STAT_NSTATS,
    > -};
    > -
    >  struct mem_cgroup_stat_cpu {
    >        s64 count[MEM_CGROUP_STAT_NSTATS];
    >  };
    >
    > +/* Per cgroup page statistics */
    > +struct mem_cgroup_page_stat {
    > +       enum mem_cgroup_page_stat_item item;
    > +       s64 value;
    > +};
    > +
    > +enum {
    > +       MEM_CGROUP_DIRTY_RATIO,
    > +       MEM_CGROUP_DIRTY_BYTES,
    > +       MEM_CGROUP_DIRTY_BACKGROUND_RATIO,
    > +       MEM_CGROUP_DIRTY_BACKGROUND_BYTES,
    > +};
    > +
    >  /*
    >  * per-zone information in memory controller.
    >  */
    > @@ -208,6 +203,9 @@ struct mem_cgroup {
    >
    >        unsigned int    swappiness;
    >
    > +       /* control memory cgroup dirty pages */
    > +       struct dirty_param dirty_param;
    > +
    >        /* set when res.limit == memsw.limit */
    >        bool            memsw_is_minimum;
    >
    > @@ -1033,6 +1031,156 @@ static unsigned int get_swappiness(struct mem_cgroup *memcg)
    >        return swappiness;
    >  }
    >
    > +static bool dirty_param_is_valid(struct dirty_param *param)
    > +{
    > +       if (param->dirty_ratio && param->dirty_bytes)
    > +               return false;
    > +       if (param->dirty_background_ratio && param->dirty_background_bytes)
    > +               return false;
    > +       return true;
    > +}
    > +
    > +static void
    > +__mem_cgroup_get_dirty_param(struct dirty_param *param, struct mem_cgroup *mem)
    > +{
    > +       param->dirty_ratio = mem->dirty_param.dirty_ratio;
    > +       param->dirty_bytes = mem->dirty_param.dirty_bytes;
    > +       param->dirty_background_ratio = mem->dirty_param.dirty_background_ratio;
    > +       param->dirty_background_bytes = mem->dirty_param.dirty_background_bytes;
    > +}
    > +
    > +/*
    > + * get_dirty_param() - get dirty memory parameters of the current memcg
    > + * @param:     a structure is filled with the dirty memory settings
    > + *
    > + * The function fills @param with the current memcg dirty memory settings. If
    > + * memory cgroup is disabled or in case of error the structure is filled with
    > + * the global dirty memory settings.
    > + */
    > +void get_dirty_param(struct dirty_param *param)
    > +{
    > +       struct mem_cgroup *memcg;
    > +
    > +       if (mem_cgroup_disabled()) {
    > +               get_global_dirty_param(param);
    > +               return;
    > +       }
    > +       /*
    > +        * It's possible that "current" may be moved to other cgroup while we
    > +        * access cgroup. But precise check is meaningless because the task can
    > +        * be moved after our access and writeback tends to take long time.
    > +        * At least, "memcg" will not be freed under rcu_read_lock().
    > +        */
    > +       while (1) {
    > +               rcu_read_lock();
    > +               memcg = mem_cgroup_from_task(current);
    > +               if (likely(memcg))
    > +                       __mem_cgroup_get_dirty_param(param, memcg);
    > +               else
    > +                       get_global_dirty_param(param);
    > +               rcu_read_unlock();
    > +               /*
    > +                * Since global and memcg dirty_param are not protected we try
    > +                * to speculatively read them and retry if we get inconsistent
    > +                * values.
    > +                */
    > +               if (likely(dirty_param_is_valid(param)))
    > +                       break;
    > +       }
    > +}
    > +
    > +static inline bool mem_cgroup_can_swap(struct mem_cgroup *memcg)
    > +{
    > +       if (!do_swap_account)
    > +               return nr_swap_pages > 0;
    > +       return !memcg->memsw_is_minimum &&
    > +               (res_counter_read_u64(&memcg->memsw, RES_LIMIT) > 0);
    > +}
    > +
    > +static s64 mem_cgroup_get_local_page_stat(struct mem_cgroup *memcg,
    > +                               enum mem_cgroup_page_stat_item item)
    > +{
    > +       s64 ret;
    > +
    > +       switch (item) {
    > +       case MEMCG_NR_DIRTYABLE_PAGES:
    > +               ret = res_counter_read_u64(&memcg->res, RES_LIMIT) -
    > +                       res_counter_read_u64(&memcg->res, RES_USAGE);
    > +               /* Translate free memory in pages */
    > +               ret >>= PAGE_SHIFT;
    > +               ret += mem_cgroup_read_stat(memcg, LRU_ACTIVE_FILE) +
    > +                       mem_cgroup_read_stat(memcg, LRU_INACTIVE_FILE);
    > +               if (mem_cgroup_can_swap(memcg))
    > +                       ret += mem_cgroup_read_stat(memcg, LRU_ACTIVE_ANON) +
    > +                               mem_cgroup_read_stat(memcg, LRU_INACTIVE_ANON);
    > +               break;
    > +       case MEMCG_NR_RECLAIM_PAGES:
    > +               ret = mem_cgroup_read_stat(memcg, MEM_CGROUP_STAT_FILE_DIRTY) +
    > +                       mem_cgroup_read_stat(memcg,
    > +                                       MEM_CGROUP_STAT_UNSTABLE_NFS);
    > +               break;
    > +       case MEMCG_NR_WRITEBACK:
    > +               ret = mem_cgroup_read_stat(memcg, MEM_CGROUP_STAT_WRITEBACK);
    > +               break;
    > +       case MEMCG_NR_DIRTY_WRITEBACK_PAGES:
    > +               ret = mem_cgroup_read_stat(memcg, MEM_CGROUP_STAT_WRITEBACK) +
    > +                       mem_cgroup_read_stat(memcg,
    > +                               MEM_CGROUP_STAT_UNSTABLE_NFS);
    > +               break;
    > +       default:
    > +               BUG_ON(1);

    Just BUG()?
    Andd add 'break;', please.

    > +       }
    > +       return ret;
    > +}
    > +
    > +static int mem_cgroup_page_stat_cb(struct mem_cgroup *mem, void *data)
    > +{
    > +       struct mem_cgroup_page_stat *stat = (struct mem_cgroup_page_stat *)data;
    > +
    > +       stat->value += mem_cgroup_get_local_page_stat(mem, stat->item);
    > +       return 0;
    > +}
    > +
    > +/*
    > + * mem_cgroup_has_dirty_limit() - check if current memcg has local dirty limits
    > + *
    > + * Return true if the current memory cgroup has local dirty memory settings,
    > + * false otherwise.
    > + */
    > +bool mem_cgroup_has_dirty_limit(void)
    > +{
    > +       if (mem_cgroup_disabled())
    > +               return false;
    > +       return mem_cgroup_from_task(current) != NULL;
    > +}
    > +
    > +/*
    > + * mem_cgroup_page_stat() - get memory cgroup file cache statistics
    > + * @item:      memory statistic item exported to the kernel
    > + *
    > + * Return the accounted statistic value, or a negative value in case of error.
    > + */
    > +s64 mem_cgroup_page_stat(enum mem_cgroup_page_stat_item item)
    > +{
    > +       struct mem_cgroup_page_stat stat = {};
    > +       struct mem_cgroup *memcg;
    > +
    > +       rcu_read_lock();
    > +       memcg = mem_cgroup_from_task(current);
    > +       if (memcg) {
    > +               /*
    > +                * Recursively evaulate page statistics against all cgroup
    > +                * under hierarchy tree
    > +                */
    > +               stat.item = item;
    > +               mem_cgroup_walk_tree(memcg, &stat, mem_cgroup_page_stat_cb);
    > +       } else
    > +               stat.value = -EINVAL;
    > +       rcu_read_unlock();
    > +
    > +       return stat.value;
    > +}
    > +
    >  static int mem_cgroup_count_children_cb(struct mem_cgroup *mem, void *data)
    >  {
    >        int *val = data;
    > @@ -1275,34 +1423,70 @@ static void record_last_oom(struct mem_cgroup *mem)
    >  }
    >
    >  /*
    > - * Currently used to update mapped file statistics, but the routine can be
    > - * generalized to update other statistics as well.
    > + * Generalized routine to update file cache's status for memcg.
    > + *
    > + * Before calling this, mapping->tree_lock should be held and preemption is
    > + * disabled.  Then, it's guarnteed that the page is not uncharged while we
    > + * access page_cgroup. We can make use of that.
    >  */
    > -void mem_cgroup_update_file_mapped(struct page *page, int val)
    > +void mem_cgroup_update_stat(struct page *page,
    > +                       enum mem_cgroup_stat_index idx, int val)
    >  {
    >        struct mem_cgroup *mem;
    >        struct page_cgroup *pc;
    >
    > +       if (mem_cgroup_disabled())
    > +               return;
    >        pc = lookup_page_cgroup(page);
    > -       if (unlikely(!pc))
    > +       if (unlikely(!pc) || !PageCgroupUsed(pc))
    >                return;
    >
    > -       lock_page_cgroup(pc);
    > -       mem = pc->mem_cgroup;
    > -       if (!mem)
    > -               goto done;
    > -
    > -       if (!PageCgroupUsed(pc))
    > -               goto done;
    > -
    > +       lock_page_cgroup_migrate(pc);
    >        /*
    > -        * Preemption is already disabled. We can use __this_cpu_xxx
    > -        */
    > -       __this_cpu_add(mem->stat->count[MEM_CGROUP_STAT_FILE_MAPPED], val);
    > -
    > -done:
    > -       unlock_page_cgroup(pc);
    > +       * It's guarnteed that this page is never uncharged.
    > +       * The only racy problem is moving account among memcgs.
    > +       */
    > +       switch (idx) {
    > +       case MEM_CGROUP_STAT_FILE_MAPPED:
    > +               if (val > 0)
    > +                       SetPageCgroupFileMapped(pc);
    > +               else
    > +                       ClearPageCgroupFileMapped(pc);
    > +               break;
    > +       case MEM_CGROUP_STAT_FILE_DIRTY:
    > +               if (val > 0)
    > +                       SetPageCgroupDirty(pc);
    > +               else
    > +                       ClearPageCgroupDirty(pc);
    > +               break;
    > +       case MEM_CGROUP_STAT_WRITEBACK:
    > +               if (val > 0)
    > +                       SetPageCgroupWriteback(pc);
    > +               else
    > +                       ClearPageCgroupWriteback(pc);
    > +               break;
    > +       case MEM_CGROUP_STAT_WRITEBACK_TEMP:
    > +               if (val > 0)
    > +                       SetPageCgroupWritebackTemp(pc);
    > +               else
    > +                       ClearPageCgroupWritebackTemp(pc);
    > +               break;
    > +       case MEM_CGROUP_STAT_UNSTABLE_NFS:
    > +               if (val > 0)
    > +                       SetPageCgroupUnstableNFS(pc);
    > +               else
    > +                       ClearPageCgroupUnstableNFS(pc);
    > +               break;
    > +       default:
    > +               BUG();
    > +               break;
    > +       }
    > +       mem = pc->mem_cgroup;
    > +       if (likely(mem))
    > +               __this_cpu_add(mem->stat->count[idx], val);
    > +       unlock_page_cgroup_migrate(pc);
    >  }
    > +EXPORT_SYMBOL_GPL(mem_cgroup_update_stat);
    >
    >  /*
    >  * size of first charge trial. "32" comes from vmscan.c's magic value.
    > @@ -1701,6 +1885,45 @@ static void __mem_cgroup_commit_charge(struct mem_cgroup *mem,
    >        memcg_check_events(mem, pc->page);
    >  }
    >
    > +/*
    > + * Update file cache accounted statistics on task migration.
    > + *
    > + * TODO: We don't move charges of file (including shmem/tmpfs) pages for now.
    > + * So, at the moment this function simply returns without updating accounted
    > + * statistics, because we deal only with anonymous pages here.
    > + */
    > +static void __mem_cgroup_update_file_stat(struct page_cgroup *pc,
    > +       struct mem_cgroup *from, struct mem_cgroup *to)
    > +{
    > +       struct page *page = pc->page;
    > +
    > +       if (!page_mapped(page) || PageAnon(page))
    > +               return;
    > +
    > +       if (PageCgroupFileMapped(pc)) {
    > +               __this_cpu_dec(from->stat->count[MEM_CGROUP_STAT_FILE_MAPPED]);
    > +               __this_cpu_inc(to->stat->count[MEM_CGROUP_STAT_FILE_MAPPED]);
    > +       }
    > +       if (PageCgroupDirty(pc)) {
    > +               __this_cpu_dec(from->stat->count[MEM_CGROUP_STAT_FILE_DIRTY]);
    > +               __this_cpu_inc(to->stat->count[MEM_CGROUP_STAT_FILE_DIRTY]);
    > +       }
    > +       if (PageCgroupWriteback(pc)) {
    > +               __this_cpu_dec(from->stat->count[MEM_CGROUP_STAT_WRITEBACK]);
    > +               __this_cpu_inc(to->stat->count[MEM_CGROUP_STAT_WRITEBACK]);
    > +       }
    > +       if (PageCgroupWritebackTemp(pc)) {
    > +               __this_cpu_dec(
    > +                       from->stat->count[MEM_CGROUP_STAT_WRITEBACK_TEMP]);
    > +               __this_cpu_inc(to->stat->count[MEM_CGROUP_STAT_WRITEBACK_TEMP]);
    > +       }
    > +       if (PageCgroupUnstableNFS(pc)) {
    > +               __this_cpu_dec(
    > +                       from->stat->count[MEM_CGROUP_STAT_UNSTABLE_NFS]);
    > +               __this_cpu_inc(to->stat->count[MEM_CGROUP_STAT_UNSTABLE_NFS]);
    > +       }
    > +}
    > +
    >  /**
    >  * __mem_cgroup_move_account - move account of the page
    >  * @pc:        page_cgroup of the page.
    > @@ -1721,22 +1944,16 @@ static void __mem_cgroup_commit_charge(struct mem_cgroup *mem,
    >  static void __mem_cgroup_move_account(struct page_cgroup *pc,
    >        struct mem_cgroup *from, struct mem_cgroup *to, bool uncharge)
    >  {
    > -       struct page *page;
    > -
    >        VM_BUG_ON(from == to);
    >        VM_BUG_ON(PageLRU(pc->page));
    >        VM_BUG_ON(!PageCgroupLocked(pc));
    >        VM_BUG_ON(!PageCgroupUsed(pc));
    >        VM_BUG_ON(pc->mem_cgroup != from);
    >
    > -       page = pc->page;
    > -       if (page_mapped(page) && !PageAnon(page)) {
    > -               /* Update mapped_file data for mem_cgroup */
    > -               preempt_disable();
    > -               __this_cpu_dec(from->stat->count[MEM_CGROUP_STAT_FILE_MAPPED]);
    > -               __this_cpu_inc(to->stat->count[MEM_CGROUP_STAT_FILE_MAPPED]);
    > -               preempt_enable();
    > -       }
    > +       preempt_disable();
    > +       lock_page_cgroup_migrate(pc);
    > +       __mem_cgroup_update_file_stat(pc, from, to);
    > +
    >        mem_cgroup_charge_statistics(from, pc, false);
    >        if (uncharge)
    >                /* This is not "cancel", but cancel_charge does all we need. */
    > @@ -1745,6 +1962,8 @@ static void __mem_cgroup_move_account(struct page_cgroup *pc,
    >        /* caller should have done css_get */
    >        pc->mem_cgroup = to;
    >        mem_cgroup_charge_statistics(to, pc, true);
    > +       unlock_page_cgroup_migrate(pc);
    > +       preempt_enable();
    >        /*
    >         * We charges against "to" which may not have any tasks. Then, "to"
    >         * can be under rmdir(). But in current implementation, caller of
    > @@ -3042,6 +3261,10 @@ enum {
    >        MCS_PGPGIN,
    >        MCS_PGPGOUT,
    >        MCS_SWAP,
    > +       MCS_FILE_DIRTY,
    > +       MCS_WRITEBACK,
    > +       MCS_WRITEBACK_TEMP,
    > +       MCS_UNSTABLE_NFS,
    >        MCS_INACTIVE_ANON,
    >        MCS_ACTIVE_ANON,
    >        MCS_INACTIVE_FILE,
    > @@ -3064,6 +3287,10 @@ struct {
    >        {"pgpgin", "total_pgpgin"},
    >        {"pgpgout", "total_pgpgout"},
    >        {"swap", "total_swap"},
    > +       {"filedirty", "dirty_pages"},
    > +       {"writeback", "writeback_pages"},
    > +       {"writeback_tmp", "writeback_temp_pages"},
    > +       {"nfs", "nfs_unstable"},
    >        {"inactive_anon", "total_inactive_anon"},
    >        {"active_anon", "total_active_anon"},
    >        {"inactive_file", "total_inactive_file"},
    > @@ -3092,6 +3319,14 @@ static int mem_cgroup_get_local_stat(struct mem_cgroup *mem, void *data)
    >                val = mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_SWAPOUT);
    >                s->stat[MCS_SWAP] += val * PAGE_SIZE;
    >        }
    > +       val = mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_FILE_DIRTY);
    > +       s->stat[MCS_FILE_DIRTY] += val;
    > +       val = mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_WRITEBACK);
    > +       s->stat[MCS_WRITEBACK] += val;
    > +       val = mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_WRITEBACK_TEMP);
    > +       s->stat[MCS_WRITEBACK_TEMP] += val;
    > +       val = mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_UNSTABLE_NFS);
    > +       s->stat[MCS_UNSTABLE_NFS] += val;
    >
    >        /* per zone stat */
    >        val = mem_cgroup_get_local_zonestat(mem, LRU_INACTIVE_ANON);
    > @@ -3453,6 +3688,60 @@ unlock:
    >        return ret;
    >  }
    >
    > +static u64 mem_cgroup_dirty_read(struct cgroup *cgrp, struct cftype *cft)
    > +{
    > +       struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp);
    > +
    > +       switch (cft->private) {
    > +       case MEM_CGROUP_DIRTY_RATIO:
    > +               return memcg->dirty_param.dirty_ratio;
    > +       case MEM_CGROUP_DIRTY_BYTES:
    > +               return memcg->dirty_param.dirty_bytes;
    > +       case MEM_CGROUP_DIRTY_BACKGROUND_RATIO:
    > +               return memcg->dirty_param.dirty_background_ratio;
    > +       case MEM_CGROUP_DIRTY_BACKGROUND_BYTES:
    > +               return memcg->dirty_param.dirty_background_bytes;
    > +       default:
    > +               BUG();
    > +       }
    > +}
    > +
    > +static int
    > +mem_cgroup_dirty_write(struct cgroup *cgrp, struct cftype *cft, u64 val)
    > +{
    > +       struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp);
    > +       int type = cft->private;
    > +
    > +       if (cgrp->parent == NULL)
    > +               return -EINVAL;
    > +       if ((type == MEM_CGROUP_DIRTY_RATIO ||
    > +               type == MEM_CGROUP_DIRTY_BACKGROUND_RATIO) && val > 100)
    > +               return -EINVAL;
    > +       /*
    > +        * TODO: provide a validation check routine. And retry if validation
    > +        * fails.
    > +        */
    > +       switch (type) {
    > +       case MEM_CGROUP_DIRTY_RATIO:
    > +               memcg->dirty_param.dirty_ratio = val;
    > +               memcg->dirty_param.dirty_bytes = 0;
    > +               break;
    > +       case MEM_CGROUP_DIRTY_BYTES:
    > +               memcg->dirty_param.dirty_ratio  = 0;
    > +               memcg->dirty_param.dirty_bytes = val;
    > +               break;
    > +       case MEM_CGROUP_DIRTY_BACKGROUND_RATIO:
    > +               memcg->dirty_param.dirty_background_ratio = val;
    > +               memcg->dirty_param.dirty_background_bytes = 0;
    > +               break;
    > +       case MEM_CGROUP_DIRTY_BACKGROUND_BYTES:
    > +               memcg->dirty_param.dirty_background_ratio = 0;
    > +               memcg->dirty_param.dirty_background_bytes = val;
    > +               break;

    default:
    BUG();
    break;

    > +       }
    > +       return 0;
    > +}
    > +
    >  static struct cftype mem_cgroup_files[] = {
    >        {
    >                .name = "usage_in_bytes",
    > @@ -3504,6 +3793,30 @@ static struct cftype mem_cgroup_files[] = {
    >                .write_u64 = mem_cgroup_swappiness_write,
    >        },
    >        {
    > +               .name = "dirty_ratio",
    > +               .read_u64 = mem_cgroup_dirty_read,
    > +               .write_u64 = mem_cgroup_dirty_write,
    > +               .private = MEM_CGROUP_DIRTY_RATIO,
    > +       },
    > +       {
    > +               .name = "dirty_bytes",
    > +               .read_u64 = mem_cgroup_dirty_read,
    > +               .write_u64 = mem_cgroup_dirty_write,
    > +               .private = MEM_CGROUP_DIRTY_BYTES,
    > +       },
    > +       {
    > +               .name = "dirty_background_ratio",
    > +               .read_u64 = mem_cgroup_dirty_read,
    > +               .write_u64 = mem_cgroup_dirty_write,
    > +               .private = MEM_CGROUP_DIRTY_BACKGROUND_RATIO,
    > +       },
    > +       {
    > +               .name = "dirty_background_bytes",
    > +               .read_u64 = mem_cgroup_dirty_read,
    > +               .write_u64 = mem_cgroup_dirty_write,
    > +               .private = MEM_CGROUP_DIRTY_BACKGROUND_BYTES,
    > +       },
    > +       {
    >                .name = "move_charge_at_immigrate",
    >                .read_u64 = mem_cgroup_move_charge_read,
    >                .write_u64 = mem_cgroup_move_charge_write,
    > @@ -3762,8 +4075,21 @@ mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
    >        mem->last_scanned_child = 0;
    >        spin_lock_init(&mem->reclaim_param_lock);
    >
    > -       if (parent)
    > +       if (parent) {
    >                mem->swappiness = get_swappiness(parent);
    > +               mem->dirty_param = parent->dirty_param;
    > +       } else {
    > +               while (1) {
    > +                       get_global_dirty_param(&mem->dirty_param);
    > +                       /*
    > +                        * Since global dirty parameters are not protected we
    > +                        * try to speculatively read them and retry if we get
    > +                        * inconsistent values.
    > +                        */
    > +                       if (likely(dirty_param_is_valid(&mem->dirty_param)))
    > +                               break;
    > +               }
    > +       }
    >        atomic_set(&mem->refcnt, 1);
    >        mem->move_charge_at_immigrate = 0;
    >        mutex_init(&mem->thresholds_lock);
    > --
    > 1.6.3.3
    >
    > --
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