From: Andrew Morton <akpm@linux-foundation.org>
To: Chris Metcalf <cmetcalf@tilera.com>
Cc: Tejun Heo <tj@kernel.org>, <linux-kernel@vger.kernel.org>,
<linux-mm@kvack.org>, Thomas Gleixner <tglx@linutronix.de>,
Frederic Weisbecker <fweisbec@gmail.com>,
Cody P Schafer <cody@linux.vnet.ibm.com>
Subject: Re: [PATCH v8] mm: make lru_add_drain_all() selective
Date: Wed, 14 Aug 2013 14:12:58 -0700 [thread overview]
Message-ID: <20130814141258.6289d9926944245befffa3af@linux-foundation.org> (raw)
In-Reply-To: <201308142029.r7EKTMRw023404@farm-0002.internal.tilera.com>
On Wed, 14 Aug 2013 16:22:18 -0400 Chris Metcalf <cmetcalf@tilera.com> wrote:
> This change makes lru_add_drain_all() only selectively interrupt
> the cpus that have per-cpu free pages that can be drained.
>
> This is important in nohz mode where calling mlockall(), for
> example, otherwise will interrupt every core unnecessarily.
Changelog isn't very informative. I added this:
: This is important on workloads where nohz cores are handling 10 Gb traffic
: in userspace. Those CPUs do not enter the kernel and place pages into LRU
: pagevecs and they really, really don't want to be interrupted, or they
: drop packets on the floor.
to attempt to describe the rationale for the patch.
WARNING: multiple messages have this Message-ID (diff)
From: Andrew Morton <akpm@linux-foundation.org>
To: Chris Metcalf <cmetcalf@tilera.com>
Cc: Tejun Heo <tj@kernel.org>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Thomas Gleixner <tglx@linutronix.de>,
Frederic Weisbecker <fweisbec@gmail.com>,
Cody P Schafer <cody@linux.vnet.ibm.com>
Subject: Re: [PATCH v8] mm: make lru_add_drain_all() selective
Date: Wed, 14 Aug 2013 14:12:58 -0700 [thread overview]
Message-ID: <20130814141258.6289d9926944245befffa3af@linux-foundation.org> (raw)
In-Reply-To: <201308142029.r7EKTMRw023404@farm-0002.internal.tilera.com>
On Wed, 14 Aug 2013 16:22:18 -0400 Chris Metcalf <cmetcalf@tilera.com> wrote:
> This change makes lru_add_drain_all() only selectively interrupt
> the cpus that have per-cpu free pages that can be drained.
>
> This is important in nohz mode where calling mlockall(), for
> example, otherwise will interrupt every core unnecessarily.
Changelog isn't very informative. I added this:
: This is important on workloads where nohz cores are handling 10 Gb traffic
: in userspace. Those CPUs do not enter the kernel and place pages into LRU
: pagevecs and they really, really don't want to be interrupted, or they
: drop packets on the floor.
to attempt to describe the rationale for the patch.
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next prev parent reply other threads:[~2013-08-14 21:13 UTC|newest]
Thread overview: 104+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-06 20:22 [PATCH] mm: make lru_add_drain_all() selective Chris Metcalf
2013-08-06 20:22 ` Chris Metcalf
2013-08-06 20:22 ` [PATCH v2] " Chris Metcalf
2013-08-06 20:22 ` Chris Metcalf
2013-08-07 20:45 ` Tejun Heo
2013-08-07 20:45 ` Tejun Heo
2013-08-07 20:49 ` [PATCH v3 1/2] workqueue: add new schedule_on_cpu_mask() API Chris Metcalf
2013-08-07 20:49 ` Chris Metcalf
2013-08-07 20:52 ` [PATCH v3 2/2] mm: make lru_add_drain_all() selective Chris Metcalf
2013-08-07 20:52 ` Chris Metcalf
2013-08-07 22:48 ` [PATCH v2] " Cody P Schafer
2013-08-07 22:48 ` Cody P Schafer
2013-08-07 20:49 ` [PATCH v4 1/2] workqueue: add new schedule_on_cpu_mask() API Chris Metcalf
2013-08-07 20:49 ` Chris Metcalf
2013-08-09 15:02 ` Tejun Heo
2013-08-09 15:02 ` Tejun Heo
2013-08-09 16:12 ` Chris Metcalf
2013-08-09 16:12 ` Chris Metcalf
2013-08-09 16:30 ` Tejun Heo
2013-08-09 16:30 ` Tejun Heo
2013-08-07 20:49 ` [PATCH v5 " Chris Metcalf
2013-08-07 20:49 ` Chris Metcalf
2013-08-09 17:40 ` Tejun Heo
2013-08-09 17:40 ` Tejun Heo
2013-08-09 17:49 ` [PATCH v6 " Chris Metcalf
2013-08-09 17:49 ` Chris Metcalf
2013-08-09 17:52 ` [PATCH v6 2/2] mm: make lru_add_drain_all() selective Chris Metcalf
2013-08-09 17:52 ` Chris Metcalf
2013-08-07 20:52 ` [PATCH v5 " Chris Metcalf
2013-08-07 20:52 ` Chris Metcalf
2013-08-07 20:52 ` [PATCH v4 " Chris Metcalf
2013-08-07 20:52 ` Chris Metcalf
2013-08-12 21:05 ` Andrew Morton
2013-08-12 21:05 ` Andrew Morton
2013-08-13 1:53 ` Chris Metcalf
2013-08-13 1:53 ` Chris Metcalf
2013-08-13 19:35 ` Andrew Morton
2013-08-13 19:35 ` Andrew Morton
2013-08-13 20:19 ` Tejun Heo
2013-08-13 20:19 ` Tejun Heo
2013-08-13 20:31 ` Andrew Morton
2013-08-13 20:31 ` Andrew Morton
2013-08-13 20:59 ` Chris Metcalf
2013-08-13 20:59 ` Chris Metcalf
2013-08-13 21:13 ` Andrew Morton
2013-08-13 21:13 ` Andrew Morton
2013-08-13 22:13 ` Chris Metcalf
2013-08-13 22:13 ` Chris Metcalf
2013-08-13 22:26 ` Andrew Morton
2013-08-13 22:26 ` Andrew Morton
2013-08-13 23:04 ` Chris Metcalf
2013-08-13 23:04 ` Chris Metcalf
2013-08-13 22:51 ` [PATCH v7 1/2] workqueue: add schedule_on_each_cpu_cond Chris Metcalf
2013-08-13 22:51 ` Chris Metcalf
2013-08-13 22:53 ` [PATCH v7 2/2] mm: make lru_add_drain_all() selective Chris Metcalf
2013-08-13 22:53 ` Chris Metcalf
2013-08-13 23:29 ` Tejun Heo
2013-08-13 23:29 ` Tejun Heo
2013-08-13 23:32 ` Chris Metcalf
2013-08-13 23:32 ` Chris Metcalf
2013-08-14 6:46 ` Andrew Morton
2013-08-14 6:46 ` Andrew Morton
2013-08-14 13:05 ` Tejun Heo
2013-08-14 13:05 ` Tejun Heo
2013-08-14 16:03 ` Chris Metcalf
2013-08-14 16:03 ` Chris Metcalf
2013-08-14 16:57 ` Tejun Heo
2013-08-14 16:57 ` Tejun Heo
2013-08-14 17:18 ` Chris Metcalf
2013-08-14 17:18 ` Chris Metcalf
2013-08-14 20:07 ` Tejun Heo
2013-08-14 20:07 ` Tejun Heo
2013-08-14 20:22 ` [PATCH v8] " Chris Metcalf
2013-08-14 20:22 ` Chris Metcalf
2013-08-14 20:44 ` Andrew Morton
2013-08-14 20:44 ` Andrew Morton
2013-08-14 20:50 ` Tejun Heo
2013-08-14 20:50 ` Tejun Heo
2013-08-14 21:03 ` Andrew Morton
2013-08-14 21:03 ` Andrew Morton
2013-08-14 21:07 ` Andrew Morton
2013-08-14 21:07 ` Andrew Morton
2013-08-14 21:12 ` Andrew Morton [this message]
2013-08-14 21:12 ` Andrew Morton
2013-08-14 21:23 ` Chris Metcalf
2013-08-14 21:23 ` Chris Metcalf
2013-08-13 23:44 ` [PATCH v7 2/2] " Chris Metcalf
2013-08-13 23:44 ` Chris Metcalf
2013-08-13 23:51 ` Tejun Heo
2013-08-13 23:51 ` Tejun Heo
2013-08-13 21:07 ` [PATCH v4 " Tejun Heo
2013-08-13 21:07 ` Tejun Heo
2013-08-13 21:16 ` Andrew Morton
2013-08-13 21:16 ` Andrew Morton
2013-08-13 22:07 ` Tejun Heo
2013-08-13 22:07 ` Tejun Heo
2013-08-13 22:18 ` Andrew Morton
2013-08-13 22:18 ` Andrew Morton
2013-08-13 22:33 ` Tejun Heo
2013-08-13 22:33 ` Tejun Heo
2013-08-13 22:47 ` Andrew Morton
2013-08-13 22:47 ` Andrew Morton
2013-08-13 23:03 ` Tejun Heo
2013-08-13 23:03 ` Tejun Heo
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