From: Vladimir Davydov <vdavydov@parallels.com>
To: Tejun Heo <tj@kernel.org>
Cc: akpm@linux-foundation.org, hannes@cmpxchg.org, mhocko@kernel.org,
cgroups@vger.kernel.org, linux-mm@kvack.org, kernel-team@fb.com
Subject: Re: [PATCH 3/3] memcg: drop unnecessary cold-path tests from __memcg_kmem_bypass()
Date: Mon, 14 Sep 2015 15:51:11 +0300 [thread overview]
Message-ID: <20150914125111.GF30743@esperanza> (raw)
In-Reply-To: <20150913201509.GE25369@htj.duckdns.org>
On Sun, Sep 13, 2015 at 04:15:09PM -0400, Tejun Heo wrote:
> __memcg_kmem_bypass() decides whether a kmem allocation should be
> bypassed to the root memcg. Some conditions that it tests are valid
> criteria regarding who should be held accountable; however, there are
> a couple unnecessary tests for cold paths - __GFP_FAIL and
> fatal_signal_pending().
>
> The previous patch updated try_charge() to handle both __GFP_FAIL and
> dying tasks correctly and the only thing these two tests are doing is
> making accounting less accurate and sprinkling tests for cold path
> conditions in the hot paths. There's nothing meaningful gained by
> these extra tests.
>
> This patch removes the two unnecessary tests from
> __memcg_kmem_bypass().
>
> Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Vladimir Davydov <vdavydov@parallels.com>
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next prev parent reply other threads:[~2015-09-14 12:51 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-13 20:14 [PATCH 1/3] memcg: collect kmem bypass conditions into __memcg_kmem_bypass() Tejun Heo
2015-09-13 20:14 ` [PATCH 2/3] memcg: ratify and consolidate over-charge handling Tejun Heo
2015-09-13 20:15 ` [PATCH 3/3] memcg: drop unnecessary cold-path tests from __memcg_kmem_bypass() Tejun Heo
2015-09-14 12:51 ` Vladimir Davydov [this message]
2015-09-14 19:40 ` Michal Hocko
2015-09-14 12:44 ` [PATCH 2/3] memcg: ratify and consolidate over-charge handling Vladimir Davydov
2015-09-14 15:51 ` Tejun Heo
2015-09-14 19:32 ` Michal Hocko
2015-09-14 19:56 ` Tejun Heo
2015-09-15 8:01 ` Michal Hocko
2015-09-15 15:50 ` Tejun Heo
2015-09-14 20:07 ` [PATCH v2 " Tejun Heo
2015-09-15 16:18 ` Johannes Weiner
2015-09-14 9:03 ` [PATCH 1/3] memcg: collect kmem bypass conditions into __memcg_kmem_bypass() Vladimir Davydov
2015-09-14 15:21 ` Michal Hocko
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