From: sashiko-bot@kernel.org
To: "Jianping Liu" <frankljpliu@gmail.com>, linux-ext4@vger.kernel.org
Cc: tytso@mit.edu
Subject: Re: [PATCH] ext4: fix soft lockup while shrinking the extent status cache
Date: Wed, 28 Oct 2026 06:21:54 +0000 [thread overview]
Message-ID: <sashiko-outbox-187558@kernel.org> (raw)
In-Reply-To: <20261028061628.1209508-1-frankljpliu@gmail.com>
> From: Jianping Liu <frankjpliu@tencent.com>
>
> __es_shrink() walks sbi->s_es_list and reclaims extents from each
> inode. On a non-preemptible kernel that walk never gives up the CPU.
>
> There is a soft lockup report on our company's machine. The machine
> with millions of active inodes, 256 CPUs, and heavy memory pressure,
> concurrent shrinkers run too long.
>
> i_es_lock is dropped after es_reclaim_extents(), and s_es_lock is not
> taken again until the next inode. Once the shrink has run for one
> second, call cond_resched() so the CPU can be scheduled before the
> scan continues.
>
> Signed-off-by: Jianping Liu <frankjpliu@tencent.com>
Sashiko has reviewed this patch and found no issues.
--
Sashiko AI review · https://sashiko.dev/#/patchset/20261028061628.1209508-1-frankljpliu@gmail.com?part=1
prev parent reply other threads:[~2026-10-28 6:21 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-28 6:16 [PATCH] ext4: fix soft lockup while shrinking the extent status cache Jianping Liu
2026-10-28 6:21 ` sashiko-bot [this message]
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