From: Chris Down <chris@chrisdown.name>
To: zangchunxin@bytedance.com
Cc: akpm@linux-foundation.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org,
Muchun Song <songmuchun@bytedance.com>
Subject: Re: [PATCH] mm/vmscan: fix infinite loop in drop_slab_node
Date: Tue, 8 Sep 2020 16:09:45 +0100 [thread overview]
Message-ID: <20200908150945.GA1301981@chrisdown.name> (raw)
In-Reply-To: <20200908142456.89626-1-zangchunxin@bytedance.com>
drop_caches by its very nature can be extremely performance intensive -- if
someone wants to abort after trying too long, they can just send a
TASK_KILLABLE signal, no? If exiting the loop and returning to usermode doesn't
reliably work when doing that, then _that's_ something to improve, but this
looks premature to me until that's demonstrated not to work.
zangchunxin@bytedance.com writes:
>In one drop caches action, only traverse memcg once maybe is better.
>If user need more memory, they can do drop caches again.
Can you please provide some measurements of the difference in reclamation in
practice?
next prev parent reply other threads:[~2020-09-08 15:09 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-08 14:24 zangchunxin
2020-09-08 15:09 ` Chris Down [this message]
2020-09-08 15:42 ` Vlastimil Babka
2020-09-08 17:55 ` Chris Down
2020-09-09 4:19 ` [External] " Muchun Song
2020-09-09 9:59 ` Chris Down
2020-09-09 12:10 ` Muchun Song
2020-09-09 15:26 ` 臧春鑫
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