From: Christoph Hellwig <hch@infradead.org>
To: Yongcheng Yang <yoyang@redhat.com>
Cc: fstests@vger.kernel.org, smayhew@redhat.com, zlang@redhat.com,
linux-nfs@vger.kernel.org
Subject: Re: [PATCH] generic/551: prevent OOM on NFS on systems with no swap memory
Date: Tue, 24 Mar 2026 22:52:05 -0700 [thread overview]
Message-ID: <acN4BV5QmtP2W_WK@infradead.org> (raw)
In-Reply-To: <20260325035854.2262636-1-yoyang@redhat.com>
On Wed, Mar 25, 2026 at 11:58:22AM +0800, Yongcheng Yang wrote:
> From: Scott Mayhew <smayhew@redhat.com>
>
> We have frequently observed the oom-killer killing aio-dio-write-verify
> when generic/551 is run on NFS filesystems on virtual machines in AWS.
>
> Virtual machines in AWS typically don't have a swap partition, so check
> for that condition when testing NFS and only use 90% of available memory
> when generating the list of write operations passed to
> aio-dio-write-verify.
I don't think this is a good idea. The proper fix is reduce whatever
crazy large memory allocations this workloads causes in NFS. I suspect
it might be page lists or similar, and just breaking them into somewhat
smaller chunks and/or using potentially failing allocations to
dynamically adjust would help.
next prev parent reply other threads:[~2026-03-25 5:52 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-25 3:58 [PATCH] generic/551: prevent OOM on NFS on systems with no swap memory Yongcheng Yang
2026-03-25 5:52 ` Christoph Hellwig [this message]
2026-03-25 15:09 ` Darrick J. Wong
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=acN4BV5QmtP2W_WK@infradead.org \
--to=hch@infradead.org \
--cc=fstests@vger.kernel.org \
--cc=linux-nfs@vger.kernel.org \
--cc=smayhew@redhat.com \
--cc=yoyang@redhat.com \
--cc=zlang@redhat.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox