From: Michal Hocko <mhocko@kernel.org>
To: Mikulas Patocka <mpatocka@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>, NeilBrown <neilb@suse.com>,
Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>,
LKML <linux-kernel@vger.kernel.org>,
linux-mm@kvack.org,
"dm-devel@redhat.com David Rientjes" <rientjes@google.com>,
Ondrej Kozina <okozina@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
Douglas Anderson <dianders@chromium.org>,
shli@kernel.org, Dmitry Torokhov <dmitry.torokhov@gmail.com>
Subject: Re: [dm-devel] [RFC PATCH 2/2] mm, mempool: do not throttle PF_LESS_THROTTLE tasks
Date: Mon, 28 Nov 2016 15:06:51 +0100 [thread overview]
Message-ID: <20161128140651.GL14788@dhcp22.suse.cz> (raw)
In-Reply-To: <alpine.LRH.2.02.1611241158250.9110@file01.intranet.prod.int.rdu2.redhat.com>
On Thu 24-11-16 12:10:08, Mikulas Patocka wrote:
>
>
> On Thu, 24 Nov 2016, Michal Hocko wrote:
[...]
> > Please note that even
> > GFP_NOWAIT allocations will wake up kspwad which should clean up that
>
> The mempool is also using GFP_NOIO allocations - so do you claim that it
> should not use GFP_NOIO too?
No, I am not claiming that. The last time I have asked the throttling
didn't seem to serious enough to cause any problems. If the memory
reclaim throttling is serious enough then let's measure and evaluate it.
> You should provide a clear API that the block device drivers should use to
> allocate memory - not to apply band aid to vm throttling problems as they
> are being discovered.
This is easier said than done, I am afraid. We have been using GFP_NOIO
in mempool for years and there were no major complains.
--
Michal Hocko
SUSE Labs
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next prev parent reply other threads:[~2016-11-28 14:06 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-18 8:39 [RFC PATCH 0/2] mempool vs. page allocator interaction Michal Hocko
2016-07-18 8:41 ` [RFC PATCH 1/2] mempool: do not consume memory reserves from the reclaim path Michal Hocko
2016-07-18 8:41 ` [RFC PATCH 2/2] mm, mempool: do not throttle PF_LESS_THROTTLE tasks Michal Hocko
2016-07-19 21:50 ` Mikulas Patocka
2016-07-22 8:46 ` NeilBrown
2016-07-22 9:04 ` NeilBrown
2016-07-22 9:15 ` Michal Hocko
2016-07-23 0:12 ` NeilBrown
2016-07-25 8:32 ` Michal Hocko
2016-07-25 19:23 ` Michal Hocko
2016-07-26 7:07 ` Michal Hocko
2016-07-27 3:43 ` [dm-devel] " NeilBrown
2016-07-27 18:24 ` Michal Hocko
2016-07-27 21:33 ` NeilBrown
2016-07-28 7:17 ` Michal Hocko
2016-08-03 12:53 ` Mikulas Patocka
2016-08-03 14:34 ` Michal Hocko
2016-08-04 18:49 ` Mikulas Patocka
2016-08-12 12:32 ` Michal Hocko
2016-08-13 17:34 ` Mikulas Patocka
2016-08-14 10:34 ` Michal Hocko
2016-08-15 16:15 ` Mikulas Patocka
2016-11-23 21:11 ` Mikulas Patocka
2016-11-24 13:29 ` Michal Hocko
2016-11-24 17:10 ` Mikulas Patocka
2016-11-28 14:06 ` Michal Hocko [this message]
2016-07-25 21:52 ` Mikulas Patocka
2016-07-26 7:25 ` Michal Hocko
2016-07-27 4:02 ` [dm-devel] " NeilBrown
2016-07-27 14:28 ` Mikulas Patocka
2016-07-27 18:40 ` Michal Hocko
2016-08-03 13:59 ` Mikulas Patocka
2016-08-03 14:42 ` Michal Hocko
2016-08-04 18:46 ` Mikulas Patocka
2016-07-27 21:36 ` NeilBrown
2016-07-19 2:00 ` [RFC PATCH 1/2] mempool: do not consume memory reserves from the reclaim path David Rientjes
2016-07-19 7:49 ` Michal Hocko
2016-07-19 13:54 ` Johannes Weiner
2016-07-19 14:19 ` Michal Hocko
2016-07-19 22:01 ` Mikulas Patocka
2016-07-19 20:45 ` David Rientjes
2016-07-20 8:15 ` Michal Hocko
2016-07-20 21:06 ` David Rientjes
2016-07-21 8:52 ` Michal Hocko
2016-07-21 12:13 ` Johannes Weiner
2016-07-21 14:53 ` Michal Hocko
2016-07-21 15:26 ` Johannes Weiner
2016-07-22 1:41 ` NeilBrown
2016-07-22 6:37 ` Michal Hocko
2016-07-22 12:26 ` Vlastimil Babka
2016-07-22 19:44 ` Andrew Morton
2016-07-23 18:52 ` Vlastimil Babka
2016-07-19 21:50 ` Mikulas Patocka
2016-07-20 6:44 ` Michal Hocko
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