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SubjectRe: [PATCH -mmotm 4/5] memcg: dirty pages accounting and limiting infrastructure
On Mon, 15 Mar 2010 00:26:41 +0100, 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 | 92 ++++++++-
> mm/memcontrol.c | 484 +++++++++++++++++++++++++++++++++++++++++---
> 2 files changed, 540 insertions(+), 36 deletions(-)
>
> diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
> index 88d3f9e..0602ec9 100644
> --- a/include/linux/memcontrol.h
> +++ b/include/linux/memcontrol.h
> @@ -19,12 +19,55 @@
>
> #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_read_page_stat_item {
> + MEMCG_NR_DIRTYABLE_PAGES,
> + MEMCG_NR_RECLAIM_PAGES,
> + MEMCG_NR_WRITEBACK,
> + MEMCG_NR_DIRTY_WRITEBACK_PAGES,
> +};
> +
> +/* File cache pages accounting */
> +enum mem_cgroup_write_page_stat_item {
> + MEMCG_NR_FILE_MAPPED, /* # of pages charged as file rss */
> + MEMCG_NR_FILE_DIRTY, /* # of dirty pages in page cache */
> + MEMCG_NR_FILE_WRITEBACK, /* # of pages under writeback */
> + MEMCG_NR_FILE_WRITEBACK_TEMP, /* # of pages under writeback using
> + temporary buffers */
> + MEMCG_NR_FILE_UNSTABLE_NFS, /* # of NFS unstable pages */
> +
> + MEMCG_NR_FILE_NSTAT,
> +};
> +
> +/* Dirty memory parameters */
> +struct vm_dirty_param {
> + int dirty_ratio;
> + int dirty_background_ratio;
> + unsigned long dirty_bytes;
> + unsigned long dirty_background_bytes;
> +};
> +
> +/*
> + * TODO: provide a validation check routine. And retry if validation
> + * fails.
> + */
> +static inline void get_global_vm_dirty_param(struct vm_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 +160,25 @@ 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_vm_dirty_param(struct vm_dirty_param *param);
> +extern s64 mem_cgroup_page_stat(enum mem_cgroup_read_page_stat_item item);
> +
> +extern void mem_cgroup_update_page_stat(struct page *page,
> + enum mem_cgroup_write_page_stat_item idx, bool charge);
> +
> +static inline void mem_cgroup_inc_page_stat(struct page *page,
> + enum mem_cgroup_write_page_stat_item idx)
> +{
> + mem_cgroup_update_page_stat(page, idx, true);
> +}
> +
> +static inline void mem_cgroup_dec_page_stat(struct page *page,
> + enum mem_cgroup_write_page_stat_item idx)
> +{
> + mem_cgroup_update_page_stat(page, idx, false);
> +}
> +
> static inline bool mem_cgroup_disabled(void)
> {
> if (mem_cgroup_subsys.disabled)
> @@ -124,12 +186,6 @@ static inline bool mem_cgroup_disabled(void)
> return false;
> }
>
> -enum mem_cgroup_page_stat_item {
> - MEMCG_NR_FILE_MAPPED,
> - MEMCG_NR_FILE_NSTAT,
> -};
> -
> -void mem_cgroup_update_stat(struct page *page, int idx, bool charge);
> unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
> gfp_t gfp_mask, int nid,
> int zid);
> @@ -299,8 +355,18 @@ 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 s64 mem_cgroup_page_stat(enum mem_cgroup_read_page_stat_item item)
> +{
> + return -ENOSYS;
> +}
> +
> +static inline void mem_cgroup_inc_page_stat(struct page *page,
> + enum mem_cgroup_write_page_stat_item idx)
> +{
> +}
> +
> +static inline void mem_cgroup_dec_page_stat(struct page *page,
> + enum mem_cgroup_write_page_stat_item idx)
> {
> }
>
> @@ -311,6 +377,16 @@ 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_vm_dirty_param(struct vm_dirty_param *param)
> +{
> + get_global_vm_dirty_param(param);
> +}
> +
> #endif /* CONFIG_CGROUP_MEM_CONT */
>
> #endif /* _LINUX_MEMCONTROL_H */
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index b7c23ea..91770d0 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -80,14 +80,21 @@ 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_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 */
>
> + /* File cache pages accounting */
> + MEM_CGROUP_STAT_FILE_MAPPED, /* # of pages charged as file rss */
> + 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,
> };
>
> @@ -95,6 +102,19 @@ struct mem_cgroup_stat_cpu {
> s64 count[MEM_CGROUP_STAT_NSTATS];
> };
>
> +/* Per cgroup page statistics */
> +struct mem_cgroup_page_stat {
> + enum mem_cgroup_read_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 +228,9 @@ struct mem_cgroup {
>
> unsigned int swappiness;
>
> + /* control memory cgroup dirty pages */
> + struct vm_dirty_param dirty_param;
> +
> /* set when res.limit == memsw.limit */
> bool memsw_is_minimum;
>
> @@ -1033,6 +1056,189 @@ static unsigned int get_swappiness(struct mem_cgroup *memcg)
> return swappiness;
> }
>
> +static bool dirty_param_is_valid(struct vm_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 vm_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_vm_dirty_param() - get dirty memory parameters of the current memcg
> + * @param: a structure that 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_vm_dirty_param(struct vm_dirty_param *param)
> +{
> + struct mem_cgroup *memcg;
> +
> + if (mem_cgroup_disabled()) {
> + get_global_vm_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_vm_dirty_param(param);
> + rcu_read_unlock();
> + /*
> + * Since global and memcg vm_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;
> + }
> +}
> +
> +/*
> + * 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)
> +{
> + struct mem_cgroup *mem;
> +
> + if (mem_cgroup_disabled())
> + return false;
> + mem = mem_cgroup_from_task(current);
> + return mem && !mem_cgroup_is_root(mem);
> +}
> +
> +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_read_page_stat_item item)
> +{
> + s64 ret;
> +
> + switch (item) {
> + case MEMCG_NR_DIRTYABLE_PAGES:
> + 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();
> + break;
> + }
> + 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;
> +}
> +
> +static unsigned long long
> +memcg_get_hierarchical_free_pages(struct mem_cgroup *mem)
> +{
> + struct cgroup *cgroup;
> + unsigned long long min_free, free;
> +
> + min_free = res_counter_read_u64(&mem->res, RES_LIMIT) -
> + res_counter_read_u64(&mem->res, RES_USAGE);
> + cgroup = mem->css.cgroup;
> + if (!mem->use_hierarchy)
> + goto out;
> +
> + while (cgroup->parent) {
> + cgroup = cgroup->parent;
> + mem = mem_cgroup_from_cont(cgroup);
> + if (!mem->use_hierarchy)
> + break;
> + free = res_counter_read_u64(&mem->res, RES_LIMIT) -
> + res_counter_read_u64(&mem->res, RES_USAGE);
> + min_free = min(min_free, free);
> + }
> +out:
> + /* Translate free memory in pages */
> + return min_free >> PAGE_SHIFT;
> +}
> +
> +/*
> + * 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_read_page_stat_item item)
> +{
> + struct mem_cgroup_page_stat stat = {};
> + struct mem_cgroup *mem;
> +
> + rcu_read_lock();
> + mem = mem_cgroup_from_task(current);
> + if (mem && !mem_cgroup_is_root(mem)) {
> + /*
> + * If we're looking for dirtyable pages we need to evaluate
> + * free pages depending on the limit and usage of the parents
> + * first of all.
> + */
> + if (item == MEMCG_NR_DIRTYABLE_PAGES)
> + stat.value = memcg_get_hierarchical_free_pages(mem);
> + /*
> + * Recursively evaluate page statistics against all cgroup
> + * under hierarchy tree
> + */
> + stat.item = item;
> + mem_cgroup_walk_tree(mem, &stat, mem_cgroup_page_stat_cb);
> + } else
> + stat.value = -EINVAL;
> + rcu_read_unlock();
> +
> + return stat.value;
> +}
> +
hmm, mem_cgroup_page_stat() can return negative value, but you place BUG_ON()
in [5/5] to check it returns negative value. What happens if the current is moved
to root between mem_cgroup_has_dirty_limit() and mem_cgroup_page_stat() ?
How about making mem_cgroup_has_dirty_limit() return the target mem_cgroup, and
passing the mem_cgroup to mem_cgroup_page_stat() ?

> static int mem_cgroup_count_children_cb(struct mem_cgroup *mem, void *data)
> {
> int *val = data;
> @@ -1344,24 +1550,16 @@ bool mem_cgroup_handle_oom(struct mem_cgroup *mem, gfp_t mask)
> return true;
> }
>
> -/*
> - * Currently used to update mapped file statistics, but the routine can be
> - * generalized to update other statistics as well.
> - */
> -void __mem_cgroup_update_stat(struct page_cgroup *pc, int idx, bool charge)
> +static void __mem_cgroup_update_page_stat(struct page_cgroup *pc,
> + int idx, bool charge)
> {
> struct mem_cgroup *mem;
> - int val;
> + int val = charge ? 1 : -1;
>
> mem = pc->mem_cgroup;
> if (!mem || !PageCgroupUsed(pc))
> return;
>
> - if (charge)
> - val = 1;
> - else
> - val = -1;
> -
> switch (idx) {
> case MEMCG_NR_FILE_MAPPED:
> if (charge) {
> @@ -1377,6 +1575,62 @@ void __mem_cgroup_update_stat(struct page_cgroup *pc, int idx, bool charge)
> }
> idx = MEM_CGROUP_STAT_FILE_MAPPED;
> break;
> + case MEMCG_NR_FILE_DIRTY:
> + if (charge) {
> + if (!PageCgroupFileDirty(pc))
> + SetPageCgroupFileDirty(pc);
> + else
> + val = 0;
> + } else {
> + if (PageCgroupFileDirty(pc))
> + ClearPageCgroupFileDirty(pc);
> + else
> + val = 0;
> + }
> + idx = MEM_CGROUP_STAT_FILE_DIRTY;
> + break;
> + case MEMCG_NR_FILE_WRITEBACK:
> + if (charge) {
> + if (!PageCgroupFileWriteback(pc))
> + SetPageCgroupFileWriteback(pc);
> + else
> + val = 0;
> + } else {
> + if (PageCgroupFileWriteback(pc))
> + ClearPageCgroupFileWriteback(pc);
> + else
> + val = 0;
> + }
> + idx = MEM_CGROUP_STAT_WRITEBACK;
> + break;
> + case MEMCG_NR_FILE_WRITEBACK_TEMP:
> + if (charge) {
> + if (!PageCgroupFileWritebackTemp(pc))
> + SetPageCgroupFileWritebackTemp(pc);
> + else
> + val = 0;
> + } else {
> + if (PageCgroupFileWritebackTemp(pc))
> + ClearPageCgroupFileWritebackTemp(pc);
> + else
> + val = 0;
> + }
> + idx = MEM_CGROUP_STAT_WRITEBACK_TEMP;
> + break;
> + case MEMCG_NR_FILE_UNSTABLE_NFS:
> + if (charge) {
> + if (!PageCgroupFileUnstableNFS(pc))
> + SetPageCgroupFileUnstableNFS(pc);
> + else
> + val = 0;
> + } else {
> + if (PageCgroupFileUnstableNFS(pc))
> + ClearPageCgroupFileUnstableNFS(pc);
> + else
> + val = 0;
> + }
> + idx = MEM_CGROUP_STAT_UNSTABLE_NFS;
> + break;
> default:
> BUG();
> break;
> @@ -1384,34 +1638,81 @@ void __mem_cgroup_update_stat(struct page_cgroup *pc, int idx, bool charge)
> /*
> * Preemption is already disabled. We can use __this_cpu_xxx
> */
> - __this_cpu_add(mem->stat->count[idx], val);
> + if (val)
> + __this_cpu_add(mem->stat->count[idx], val);
> }
>
> -void mem_cgroup_update_stat(struct page *page, int idx, bool charge)
> +/*
> + * mem_cgroup_update_page_stat() - update memcg file cache's accounting
> + * @page: the page involved in a file cache operation.
> + * @idx: the particular file cache statistic.
> + * @charge: true to increment, false to decrement the statistic specified
> + * by @idx.
> + *
> + * Update memory cgroup file cache's accounting.
> + */
> +void mem_cgroup_update_page_stat(struct page *page,
> + enum mem_cgroup_write_page_stat_item idx, bool charge)
> {
> struct page_cgroup *pc;
>
> + if (mem_cgroup_disabled())
> + return;
> pc = lookup_page_cgroup(page);
> if (!pc || mem_cgroup_is_root(pc->mem_cgroup))
> return;
>
> if (trylock_page_cgroup(pc)) {
> - __mem_cgroup_update_stat(pc, idx, charge);
> + __mem_cgroup_update_page_stat(pc, idx, charge);
> unlock_page_cgroup(pc);
> }
> - return;
> }
> +EXPORT_SYMBOL_GPL(mem_cgroup_update_page_stat);
>
> -static void mem_cgroup_migrate_stat(struct page_cgroup *pc,
> +/* Update file cache accounted statistics on task migration. */
> +static void mem_cgroup_migrate_file_stat(struct page_cgroup *pc,
> struct mem_cgroup *from, struct mem_cgroup *to)
> {
> if (PageCgroupFileMapped(pc)) {
> __this_cpu_dec(from->stat->count[MEM_CGROUP_STAT_FILE_MAPPED]);
> - if (!mem_cgroup_is_root(to)) {
> - __this_cpu_inc(to->stat->count[MEM_CGROUP_STAT_FILE_MAPPED]);
> - } else {
> + if (!mem_cgroup_is_root(to))
> + __this_cpu_inc(
> + to->stat->count[MEM_CGROUP_STAT_FILE_MAPPED]);
> + else
> ClearPageCgroupFileMapped(pc);
> - }
> + }
> + if (PageCgroupFileDirty(pc)) {
> + __this_cpu_dec(from->stat->count[MEM_CGROUP_STAT_FILE_DIRTY]);
> + if (!mem_cgroup_is_root(to))
> + __this_cpu_inc(
> + to->stat->count[MEM_CGROUP_STAT_FILE_DIRTY]);
> + else
> + ClearPageCgroupFileDirty(pc);
> + }
> + if (PageCgroupFileWriteback(pc)) {
> + __this_cpu_dec(from->stat->count[MEM_CGROUP_STAT_WRITEBACK]);
> + if (!mem_cgroup_is_root(to))
> + __this_cpu_inc(
> + to->stat->count[MEM_CGROUP_STAT_WRITEBACK]);
> + else
> + ClearPageCgroupFileWriteback(pc);
> + }
> + if (PageCgroupFileWritebackTemp(pc)) {
> + __this_cpu_dec(
> + from->stat->count[MEM_CGROUP_STAT_WRITEBACK_TEMP]);
> + if (!mem_cgroup_is_root(to))
> + __this_cpu_inc(to->stat->count[
> + MEM_CGROUP_STAT_WRITEBACK_TEMP]);
> + else
> + ClearPageCgroupFileWritebackTemp(pc);
> + }
> + if (PageCgroupFileUnstableNFS(pc)) {
> + __this_cpu_dec(from->stat->count[MEM_CGROUP_STAT_UNSTABLE_NFS]);
> + if (!mem_cgroup_is_root(to))
> + __this_cpu_inc(
> + to->stat->count[MEM_CGROUP_STAT_UNSTABLE_NFS]);
> + else
> + ClearPageCgroupFileUnstableNFS(pc);
> }
> }
>
> @@ -1425,6 +1726,23 @@ __mem_cgroup_stat_fixup(struct page_cgroup *pc, struct mem_cgroup *mem)
> __this_cpu_dec(mem->stat->count[MEM_CGROUP_STAT_FILE_MAPPED]);
> ClearPageCgroupFileMapped(pc);
> }
> + if (PageCgroupFileDirty(pc)) {
> + __this_cpu_dec(mem->stat->count[MEM_CGROUP_STAT_FILE_DIRTY]);
> + ClearPageCgroupFileDirty(pc);
> + }
> + if (PageCgroupFileWriteback(pc)) {
> + __this_cpu_dec(mem->stat->count[MEM_CGROUP_STAT_WRITEBACK]);
> + ClearPageCgroupFileWriteback(pc);
> + }
> + if (PageCgroupFileWritebackTemp(pc)) {
> + __this_cpu_dec(
> + mem->stat->count[MEM_CGROUP_STAT_WRITEBACK_TEMP]);
> + ClearPageCgroupFileWritebackTemp(pc);
> + }
> + if (PageCgroupFileUnstableNFS(pc)) {
> + __this_cpu_dec(mem->stat->count[MEM_CGROUP_STAT_UNSTABLE_NFS]);
> + ClearPageCgroupFileUnstableNFS(pc);
> + }
> }
>
> /*
> @@ -1863,7 +2181,7 @@ static void __mem_cgroup_move_account(struct page_cgroup *pc,
> VM_BUG_ON(pc->mem_cgroup != from);
>
> page = pc->page;
> - mem_cgroup_migrate_stat(pc, from, to);
> + mem_cgroup_migrate_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. */
> @@ -3168,10 +3486,14 @@ static int mem_cgroup_move_charge_write(struct cgroup *cgrp,
> enum {
> MCS_CACHE,
> MCS_RSS,
> - MCS_FILE_MAPPED,
> MCS_PGPGIN,
> MCS_PGPGOUT,
> MCS_SWAP,
> + MCS_FILE_MAPPED,
> + MCS_FILE_DIRTY,
> + MCS_WRITEBACK,
> + MCS_WRITEBACK_TEMP,
> + MCS_UNSTABLE_NFS,
> MCS_INACTIVE_ANON,
> MCS_ACTIVE_ANON,
> MCS_INACTIVE_FILE,
> @@ -3190,10 +3512,14 @@ struct {
> } memcg_stat_strings[NR_MCS_STAT] = {
> {"cache", "total_cache"},
> {"rss", "total_rss"},
> - {"mapped_file", "total_mapped_file"},
> {"pgpgin", "total_pgpgin"},
> {"pgpgout", "total_pgpgout"},
> {"swap", "total_swap"},
> + {"mapped_file", "total_mapped_file"},
> + {"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"},
Why not using "total_xxx" for total_name ?

> @@ -3212,8 +3538,6 @@ static int mem_cgroup_get_local_stat(struct mem_cgroup *mem, void *data)
> s->stat[MCS_CACHE] += val * PAGE_SIZE;
> val = mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_RSS);
> s->stat[MCS_RSS] += val * PAGE_SIZE;
> - val = mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_FILE_MAPPED);
> - s->stat[MCS_FILE_MAPPED] += val * PAGE_SIZE;
> val = mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_PGPGIN_COUNT);
> s->stat[MCS_PGPGIN] += val;
> val = mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_PGPGOUT_COUNT);
> @@ -3222,6 +3546,16 @@ 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_MAPPED);
> + s->stat[MCS_FILE_MAPPED] += 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;
>
I don't have a strong objection, but I prefer showing them in bytes.
And can you add to mem_cgroup_stat_show() something like:

for (i = 0; i < NR_MCS_STAT; i++) {
if (i == MCS_SWAP && !do_swap_account)
continue;
+ if (i >= MCS_FILE_STAT_STAR && i <= MCS_FILE_STAT_END &&
+ mem_cgroup_is_root(mem_cont))
+ continue;
cb->fill(cb, memcg_stat_strings[i].local_name, mystat.stat[i]);
}

not to show file stat in root cgroup ? It's meaningless value anyway.
Of course, you'd better mention it in [2/5] too.


Thanks,
Daisuke Nishimura.

> /* per zone stat */
> val = mem_cgroup_get_local_zonestat(mem, LRU_INACTIVE_ANON);
> @@ -3583,6 +3917,63 @@ 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",
> @@ -3634,6 +4025,30 @@ 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,
> @@ -3892,8 +4307,21 @@ 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_vm_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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