From: Christopher Lameter <cl@linux.com>
To: Tim Chen <tim.c.chen@linux.intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Mel Gorman <mgorman@techsingularity.net>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@elte.hu>, Andi Kleen <ak@linux.intel.com>,
Kan Liang <kan.liang@intel.com>,
Andrew Morton <akpm@linux-foundation.org>,
Johannes Weiner <hannes@cmpxchg.org>, Jan Kara <jack@suse.cz>,
"Eric W . Biederman" <ebiederm@xmission.com>,
Davidlohr Bueso <dave@stgolabs.net>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/2 v2] sched/wait: Break up long wake list walk
Date: Fri, 25 Aug 2017 12:46:12 -0500 (CDT) [thread overview]
Message-ID: <alpine.DEB.2.20.1708251243270.6323@nuc-kabylake> (raw)
In-Reply-To: <83f675ad385d67760da4b99cd95ee912ca7c0b44.1503677178.git.tim.c.chen@linux.intel.com>
On Fri, 25 Aug 2017, Tim Chen wrote:
> for a long time. It is a result of the numa balancing migration of hot
> pages that are shared by many threads.
I think that would also call for some work to limit numa balacing of hot
shared pages. The cache lines of hot pages are likely in present the low
level processor caches anyways so moving them would not cause a
performance benefit. Limiting the migration there could stop wasting a lot
of effort.
WARNING: multiple messages have this Message-ID (diff)
From: Christopher Lameter <cl@linux.com>
To: Tim Chen <tim.c.chen@linux.intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Mel Gorman <mgorman@techsingularity.net>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@elte.hu>, Andi Kleen <ak@linux.intel.com>,
Kan Liang <kan.liang@intel.com>,
Andrew Morton <akpm@linux-foundation.org>,
Johannes Weiner <hannes@cmpxchg.org>, Jan Kara <jack@suse.cz>,
"Eric W . Biederman" <ebiederm@xmission.com>,
Davidlohr Bueso <dave@stgolabs.net>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/2 v2] sched/wait: Break up long wake list walk
Date: Fri, 25 Aug 2017 12:46:12 -0500 (CDT) [thread overview]
Message-ID: <alpine.DEB.2.20.1708251243270.6323@nuc-kabylake> (raw)
In-Reply-To: <83f675ad385d67760da4b99cd95ee912ca7c0b44.1503677178.git.tim.c.chen@linux.intel.com>
On Fri, 25 Aug 2017, Tim Chen wrote:
> for a long time. It is a result of the numa balancing migration of hot
> pages that are shared by many threads.
I think that would also call for some work to limit numa balacing of hot
shared pages. The cache lines of hot pages are likely in present the low
level processor caches anyways so moving them would not cause a
performance benefit. Limiting the migration there could stop wasting a lot
of effort.
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next prev parent reply other threads:[~2017-08-25 17:46 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-25 16:13 [PATCH 1/2 v2] sched/wait: Break up long wake list walk Tim Chen
2017-08-25 16:13 ` Tim Chen
2017-08-25 16:13 ` [PATCH 2/2 v2] sched/wait: Introduce lock breaker in wake_up_page_bit Tim Chen
2017-08-25 16:13 ` Tim Chen
2017-08-25 19:58 ` Linus Torvalds
2017-08-25 19:58 ` Linus Torvalds
2017-08-25 22:19 ` Tim Chen
2017-08-25 22:19 ` Tim Chen
2017-08-25 22:51 ` Linus Torvalds
2017-08-25 23:03 ` Linus Torvalds
2017-08-26 0:31 ` Linus Torvalds
2017-08-26 0:31 ` Linus Torvalds
2017-08-26 2:54 ` Linus Torvalds
2017-08-26 2:54 ` Linus Torvalds
2017-08-26 18:15 ` Linus Torvalds
2017-08-27 21:40 ` Linus Torvalds
2017-08-27 21:40 ` Linus Torvalds
2017-08-27 21:42 ` Linus Torvalds
2017-08-27 21:42 ` Linus Torvalds
2017-08-27 23:12 ` Linus Torvalds
2017-08-27 23:12 ` Linus Torvalds
2017-08-28 1:16 ` Nicholas Piggin
2017-08-28 1:16 ` Nicholas Piggin
2017-08-28 1:29 ` Nicholas Piggin
2017-08-28 1:29 ` Nicholas Piggin
2017-08-28 5:17 ` Linus Torvalds
2017-08-28 5:17 ` Linus Torvalds
2017-08-28 7:18 ` Nicholas Piggin
2017-08-28 7:18 ` Nicholas Piggin
2017-08-28 14:51 ` Liang, Kan
2017-08-28 16:48 ` Linus Torvalds
2017-08-28 20:01 ` Tim Chen
2017-08-28 20:01 ` Tim Chen
2017-08-29 12:57 ` Liang, Kan
2017-08-29 16:01 ` Linus Torvalds
2017-08-29 16:01 ` Linus Torvalds
2017-08-29 16:13 ` Tim Chen
2017-08-29 16:13 ` Tim Chen
2017-08-29 16:24 ` Linus Torvalds
2017-08-29 16:24 ` Linus Torvalds
2017-08-29 16:57 ` Tim Chen
2017-08-29 16:57 ` Tim Chen
2017-09-14 2:12 ` Tim Chen
2017-09-14 2:12 ` Tim Chen
2017-09-14 2:27 ` Linus Torvalds
2017-09-14 2:27 ` Linus Torvalds
2017-09-14 16:50 ` Tim Chen
2017-09-14 16:50 ` Tim Chen
2017-09-14 17:00 ` Linus Torvalds
2017-09-14 17:00 ` Linus Torvalds
2017-09-14 16:39 ` Christopher Lameter
2017-08-29 16:17 ` Tim Chen
2017-08-29 16:17 ` Tim Chen
2017-08-29 16:22 ` Linus Torvalds
2017-08-29 16:22 ` Linus Torvalds
2017-08-25 17:46 ` Christopher Lameter [this message]
2017-08-25 17:46 ` [PATCH 1/2 v2] sched/wait: Break up long wake list walk Christopher Lameter
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