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Date: Fri, 18 Feb 2011 01:04:16 +0900
From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To: Minchan Kim <minchan.kim@...il.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
linux-mm <linux-mm@...ck.org>,
LKML <linux-kernel@...r.kernel.org>,
Steven Barrett <damentz@...uorix.net>,
Ben Gamari <bgamari.foss@...il.com>,
Peter Zijlstra <peterz@...radead.org>,
Rik van Riel <riel@...hat.com>, Mel Gorman <mel@....ul.ie>,
KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
Wu Fengguang <fengguang.wu@...el.com>,
Johannes Weiner <hannes@...xchg.org>,
Nick Piggin <npiggin@...nel.dk>,
Andrea Arcangeli <aarcange@...hat.com>,
Balbir Singh <balbir@...ux.vnet.ibm.com>
Subject: Re: [PATCH v5 2/4] memcg: move memcg reclaimable page into tail of
inactive list
On Fri, 18 Feb 2011 00:08:20 +0900
Minchan Kim <minchan.kim@...il.com> wrote:
> The rotate_reclaimable_page function moves just written out
> pages, which the VM wanted to reclaim, to the end of the
> inactive list. That way the VM will find those pages first
> next time it needs to free memory.
> This patch apply the rule in memcg.
> It can help to prevent unnecessary working page eviction of memcg.
>
> Acked-by: Balbir Singh <balbir@...ux.vnet.ibm.com>
> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> Reviewed-by: Rik van Riel <riel@...hat.com>
> Cc: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> Cc: Johannes Weiner <hannes@...xchg.org>
> Signed-off-by: Minchan Kim <minchan.kim@...il.com>
> ---
> Changelog since v4:
> - add acked-by and reviewed-by
> - change description - suggested by Rik
>
> include/linux/memcontrol.h | 6 ++++++
> mm/memcontrol.c | 27 +++++++++++++++++++++++++++
> mm/swap.c | 3 ++-
> 3 files changed, 35 insertions(+), 1 deletions(-)
>
> diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
> index 3da48ae..5a5ce70 100644
> --- a/include/linux/memcontrol.h
> +++ b/include/linux/memcontrol.h
> @@ -62,6 +62,7 @@ extern int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
> gfp_t gfp_mask);
> extern void mem_cgroup_add_lru_list(struct page *page, enum lru_list lru);
> extern void mem_cgroup_del_lru_list(struct page *page, enum lru_list lru);
> +extern void mem_cgroup_rotate_reclaimable_page(struct page *page);
> extern void mem_cgroup_rotate_lru_list(struct page *page, enum lru_list lru);
> extern void mem_cgroup_del_lru(struct page *page);
> extern void mem_cgroup_move_lists(struct page *page,
> @@ -215,6 +216,11 @@ static inline void mem_cgroup_del_lru_list(struct page *page, int lru)
> return ;
> }
>
> +static inline inline void mem_cgroup_rotate_reclaimable_page(struct page *page)
> +{
> + return ;
> +}
> +
> static inline void mem_cgroup_rotate_lru_list(struct page *page, int lru)
> {
> return ;
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 686f1ce..ab8bdff 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -813,6 +813,33 @@ void mem_cgroup_del_lru(struct page *page)
> mem_cgroup_del_lru_list(page, page_lru(page));
> }
>
> +/*
> + * Writeback is about to end against a page which has been marked for immediate
> + * reclaim. If it still appears to be reclaimable, move it to the tail of the
> + * inactive list.
> + */
> +void mem_cgroup_rotate_reclaimable_page(struct page *page)
> +{
> + struct mem_cgroup_per_zone *mz;
> + struct page_cgroup *pc;
> + enum lru_list lru = page_lru_base_type(page);
> +
> + if (mem_cgroup_disabled())
> + return;
> +
> + pc = lookup_page_cgroup(page);
> + /*
> + * Used bit is set without atomic ops but after smp_wmb().
> + * For making pc->mem_cgroup visible, insert smp_rmb() here.
> + */
> + smp_rmb();
> + /* unused or root page is not rotated. */
> + if (!PageCgroupUsed(pc) || mem_cgroup_is_root(pc->mem_cgroup))
> + return;
> + mz = page_cgroup_zoneinfo(pc->mem_cgroup, page);
> + list_move_tail(&pc->lru, &mz->lists[lru]);
> +}
> +
Hmm, I'm sorry I misunderstand this. IIUC, page_lru_base_type() always returns
LRU_INACTIVE_XXX and this function may move page from active LRU to inactive LRU.
Then, LRU counters for memcg should be updated.
Could you replace after lookup like this ?
VM_BUG_ON(!PageCgroupAcctLRU(pc)) /* Implies this pages must be on some LRU */
if (!PageCgroupUsed(pc))
return;
/* Used bit check is not necessary, because there is a case Unused page
is lazily on LRU. We trust AcctLRU bit. */
mz = page_cgroup_zoneinfo(pc->mem_cgroup, page);
MEM_CGROUP_ZSTAT(mz, page_lru(page)) -= 1 << compound_order(page);
MEM_CGROUP_ZSTAT(mz, lru) += 1 << compound_order(page)
if (mem_cgroup_is_root(pc->mem_cgroup))
return;
list_move_tail(&pc->lru, &mz->lists[lru])
Thanks,
-Kame
> void mem_cgroup_rotate_lru_list(struct page *page, enum lru_list lru)
> {
> struct mem_cgroup_per_zone *mz;
> diff --git a/mm/swap.c b/mm/swap.c
> index 4aea806..1b9e4eb 100644
> --- a/mm/swap.c
> +++ b/mm/swap.c
> @@ -200,8 +200,9 @@ static void pagevec_move_tail(struct pagevec *pvec)
> spin_lock(&zone->lru_lock);
> }
> if (PageLRU(page) && !PageActive(page) && !PageUnevictable(page)) {
> - int lru = page_lru_base_type(page);
> + enum lru_list lru = page_lru_base_type(page);
> list_move_tail(&page->lru, &zone->lru[lru].list);
> + mem_cgroup_rotate_reclaimable_page(page);
> pgmoved++;
> }
> }
> --
> 1.7.1
>
> --
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