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From: Oleksandr Natalenko <oleksandr@natalenko.name>
To: linux-kernel@vger.kernel.org
Cc: linux-block@vger.kernel.org, Jens Axboe <axboe@kernel.dk>,
	Damien Le Moal <dlemoal@kernel.org>,
	John Garry <john.g.garry@oracle.com>,
	Christoph Hellwig <hch@lst.de>,
	"Martin K. Petersen" <martin.petersen@oracle.com>,
	linux-mm@kvack.org, Lorenzo Stoakes <lorenzo.stoakes@oracle.com>,
	Shakeel Butt <shakeel.butt@linux.dev>,
	Qi Zheng <zhengqi.arch@bytedance.com>,
	Michal Hocko <mhocko@kernel.org>,
	David Hildenbrand <david@redhat.com>,
	Johannes Weiner <hannes@cmpxchg.org>,
	Andrew Morton <akpm@linux-foundation.org>
Subject: [REGRESSION][BISECTED] Unexpected OOM instead of reclaiming inactive file pages
Date: Mon, 11 Aug 2025 17:48:08 +0200	[thread overview]
Message-ID: <5905724.LvFx2qVVIh@natalenko.name> (raw)

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Hello Damien.

I'm fairly confident that the following commit

459779d04ae8d block: Improve read ahead size for rotational devices

caused a regression in my test bench.

I'm running v6.17-rc1 in a small QEMU VM with virtio-scsi disk. It has got 1 GiB of RAM, so I can saturate it easily causing reclaiming mechanism to kick in.

If MGLRU is enabled:

$ echo 1000 | sudo tee /sys/kernel/mm/lru_gen/min_ttl_ms

then, once page cache builds up, an OOM happens without reclaiming inactive file pages: [1]. Note that inactive_file:506952kB, I'd expect these to be reclaimed instead, like how it happens with v6.16.

If MGLRU is disabled:

$ echo 0 | sudo tee /sys/kernel/mm/lru_gen/min_ttl_ms

then OOM doesn't occur, and things seem to work as usual.

If MGLRU is enabled, and 459779d04ae8d is reverted on top of v6.17-rc1, the OOM doesn't happen either.

Could you please check this?

Thank you.

-- 
Oleksandr Natalenko, MSE

[1]: https://paste.voidband.net/TG5OiZ29.log

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             reply	other threads:[~2025-08-11 15:55 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-08-11 15:48 Oleksandr Natalenko [this message]
2025-08-11 16:06 ` [REGRESSION][BISECTED] Unexpected OOM instead of reclaiming inactive file pages David Rientjes
2025-08-11 20:42   ` Oleksandr Natalenko
2025-08-12  0:45     ` Damien Le Moal
2025-08-12  7:37       ` Oleksandr Natalenko

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