From: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
To: Yang Shi <yang.s@alibaba-inc.com>, mhocko@kernel.org
Cc: cl@linux.com, penberg@kernel.org, rientjes@google.com,
iamjoonsoo.kim@lge.com, akpm@linux-foundation.org,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 0/2 v8] oom: capture unreclaimable slab info in oom message
Date: Thu, 28 Sep 2017 13:36:57 +0900 [thread overview]
Message-ID: <fccbce9c-a40e-621f-e9a4-17c327ed84e8@I-love.SAKURA.ne.jp> (raw)
In-Reply-To: <1506548776-67535-1-git-send-email-yang.s@alibaba-inc.com>
On 2017/09/28 6:46, Yang Shi wrote:
> Changelog v7 a??> v8:
> * Adopted Michala??s suggestion to dump unreclaim slab info when unreclaimable slabs amount > total user memory. Not only in oom panic path.
Holding slab_mutex inside dump_unreclaimable_slab() was refrained since V2
because there are
mutex_lock(&slab_mutex);
kmalloc(GFP_KERNEL);
mutex_unlock(&slab_mutex);
users. If we call dump_unreclaimable_slab() for non OOM panic path, aren't we
introducing a risk of crash (i.e. kernel panic) for regular OOM path?
We can try mutex_trylock() from dump_unreclaimable_slab() at best.
But it is still remaining unsafe, isn't it?
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next prev parent reply other threads:[~2017-09-28 4:37 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-27 21:46 Yang Shi
2017-09-27 21:46 ` [PATCH 1/2] tools: slabinfo: add "-U" option to show unreclaimable slabs only Yang Shi
2017-09-27 21:46 ` [PATCH 2/2] mm: oom: show unreclaimable slab info when unreclaimable slabs > user memory Yang Shi
2017-10-01 6:19 ` Christopher Lameter
2017-09-28 4:36 ` Tetsuo Handa [this message]
2017-09-28 17:49 ` [PATCH 0/2 v8] oom: capture unreclaimable slab info in oom message Yang Shi
2017-09-28 19:57 ` Tetsuo Handa
2017-09-28 20:21 ` Yang Shi
2017-09-28 20:45 ` Tetsuo Handa
2017-09-29 22:15 ` Yang Shi
2017-09-30 11:00 ` Tetsuo Handa
2017-10-02 15:40 ` Yang Shi
2017-10-02 11:20 ` Michal Hocko
2017-10-02 15:46 ` Yang Shi
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