From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx207.postini.com [74.125.245.207]) by kanga.kvack.org (Postfix) with SMTP id 4A8436B0083 for ; Mon, 20 Feb 2012 12:22:46 -0500 (EST) Received: by mail-bk0-f41.google.com with SMTP id y12so6268158bkt.14 for ; Mon, 20 Feb 2012 09:22:45 -0800 (PST) Subject: [PATCH v2 02/22] memcg: fix page_referencies cgroup filter on global reclaim From: Konstantin Khlebnikov Date: Mon, 20 Feb 2012 21:22:43 +0400 Message-ID: <20120220172243.22196.57870.stgit@zurg> In-Reply-To: <20120220171138.22196.65847.stgit@zurg> References: <20120220171138.22196.65847.stgit@zurg> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: linux-mm@kvack.org, Andrew Morton , linux-kernel@vger.kernel.org Cc: Hugh Dickins , KAMEZAWA Hiroyuki Global memory reclaimer should't skip referencies for any pages, even if they are shared between different cgroups. This patch adds scan_control->current_mem_cgroup, which points to currently shrinking sub-cgroup in hierarchy, at global reclaim it always NULL. Signed-off-by: Konstantin Khlebnikov --- mm/vmscan.c | 18 ++++++++++++++---- 1 files changed, 14 insertions(+), 4 deletions(-) diff --git a/mm/vmscan.c b/mm/vmscan.c index ee4d87a..4bb23ef 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -109,6 +109,12 @@ struct scan_control { struct mem_cgroup *target_mem_cgroup; /* + * Currently reclaiming memory cgroup in hierarchy, + * NULL for global reclaim. + */ + struct mem_cgroup *current_mem_cgroup; + + /* * Nodemask of nodes allowed by the caller. If NULL, all nodes * are scanned. */ @@ -701,13 +707,13 @@ enum page_references { }; static enum page_references page_check_references(struct page *page, - struct mem_cgroup_zone *mz, struct scan_control *sc) { int referenced_ptes, referenced_page; unsigned long vm_flags; - referenced_ptes = page_referenced(page, 1, mz->mem_cgroup, &vm_flags); + referenced_ptes = page_referenced(page, 1, + sc->current_mem_cgroup, &vm_flags); referenced_page = TestClearPageReferenced(page); /* Lumpy reclaim - ignore references */ @@ -828,7 +834,7 @@ static unsigned long shrink_page_list(struct list_head *page_list, } } - references = page_check_references(page, mz, sc); + references = page_check_references(page, sc); switch (references) { case PAGEREF_ACTIVATE: goto activate_locked; @@ -1735,7 +1741,7 @@ static void shrink_active_list(unsigned long nr_to_scan, continue; } - if (page_referenced(page, 0, mz->mem_cgroup, &vm_flags)) { + if (page_referenced(page, 0, sc->current_mem_cgroup, &vm_flags)) { nr_rotated += hpage_nr_pages(page); /* * Identify referenced, file-backed active pages and @@ -2159,6 +2165,9 @@ static void shrink_zone(int priority, struct zone *zone, .zone = zone, }; + if (!global_reclaim(sc)) + sc->current_mem_cgroup = memcg; + shrink_mem_cgroup_zone(priority, &mz, sc); /* * Limit reclaim has historically picked one memcg and @@ -2478,6 +2487,7 @@ unsigned long mem_cgroup_shrink_node_zone(struct mem_cgroup *memcg, .may_swap = !noswap, .order = 0, .target_mem_cgroup = memcg, + .current_mem_cgroup = memcg, }; struct mem_cgroup_zone mz = { .mem_cgroup = memcg, -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org