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From: Michal Hocko <mhocko@suse.com>
To: Vasily Averin <vvs@virtuozzo.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>,
	Vladimir Davydov <vdavydov.dev@gmail.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Shakeel Butt <shakeelb@google.com>,
	Mel Gorman <mgorman@techsingularity.net>,
	Roman Gushchin <guro@fb.com>, Uladzislau Rezki <urezki@gmail.com>,
	Vlastimil Babka <vbabka@suse.cz>,
	cgroups@vger.kernel.org, linux-mm@kvack.org,
	linux-kernel@vger.kernel.org, kernel@openvz.org
Subject: Re: [PATCH mm v3] memcg: enable memory accounting in __alloc_pages_bulk
Date: Tue, 12 Oct 2021 17:36:10 +0200	[thread overview]
Message-ID: <YWWrai/ChIgycgCo@dhcp22.suse.cz> (raw)
In-Reply-To: <60df0efd-f458-a13c-7c89-749bdab21d1d@virtuozzo.com>

On Tue 12-10-21 17:58:21, Vasily Averin wrote:
> Enable memory accounting for bulk page allocator.

ENOCHANGELOG
 
And I have to say I am not very happy about the solution. It adds a very
tricky code where it splits different charging steps apart.

Would it be just too inefficient to charge page-by-page once all pages
are already taken away from the pcp lists? This bulk should be small so
this shouldn't really cause massive problems. I mean something like

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index b37435c274cf..8bcd69195ef5 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5308,6 +5308,10 @@ unsigned long __alloc_pages_bulk(gfp_t gfp, int preferred_nid,
 
 	local_unlock_irqrestore(&pagesets.lock, flags);
 
+	if (memcg_kmem_enabled() && (gfp & __GFP_ACCOUNT)) {
+		/* charge pages here */
+	}
+
 	__count_zid_vm_events(PGALLOC, zone_idx(zone), nr_account);
 	zone_statistics(ac.preferred_zoneref->zone, zone, nr_account);
-- 
Michal Hocko
SUSE Labs


  parent reply	other threads:[~2021-10-12 15:36 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-07  8:04 memcg memory accounting in vmalloc is broken Vasily Averin
2021-10-07  8:13 ` Michal Hocko
2021-10-07  8:16   ` Michal Hocko
2021-10-07  8:50     ` Vasily Averin
2021-10-07 10:08       ` Michal Hocko
2021-10-07 10:20       ` Mel Gorman
2021-10-07 14:02         ` Vlastimil Babka
2021-10-07 14:00       ` Vlastimil Babka
2021-10-07 14:09         ` Michal Hocko
2021-10-07 19:33       ` Vasily Averin
2021-10-08  9:23         ` [PATCH memcg] memcg: enable memory accounting in __alloc_pages_bulk Vasily Averin
2021-10-08 17:35           ` Shakeel Butt
2021-10-12 10:18             ` [PATCH mm v2] " Vasily Averin
2021-10-12 13:10               ` Mel Gorman
2021-10-12 13:40                 ` Vasily Averin
2021-10-12 14:58                   ` [PATCH mm v3] " Vasily Averin
2021-10-12 15:19                     ` Shakeel Butt
2021-10-12 15:20                     ` Mel Gorman
2021-10-12 15:36                     ` Michal Hocko [this message]
2021-10-12 16:08                       ` Shakeel Butt
2021-10-12 18:24                         ` Michal Hocko
2021-10-13 16:41                           ` Shakeel Butt
2021-10-13 17:16                             ` Michal Hocko
2021-10-13 17:30                               ` Shakeel Butt
2021-10-12 18:45                       ` Vasily Averin
2021-10-14  8:02                   ` [PATCH mm v5] " Vasily Averin
2021-10-15 21:34                     ` Andrew Morton
2021-10-16  6:04                       ` Vasily Averin

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