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[2001:1c04:696:5900:5494:7046:b00d:b4]) by smtp.gmail.com with ESMTPSA id j13-20020a50ed0d000000b0056c4372c161sm760221eds.55.2024.04.05.05.49.47 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Fri, 05 Apr 2024 05:49:47 -0700 (PDT) From: Frits Hoogland Message-Id: <78A3C8B6-FCB5-480D-90B6-1675B1D89594@gmail.com> Content-Type: multipart/alternative; boundary="Apple-Mail=_471CAFCD-CCB5-449A-B97B-024D34A1D1AF" Mime-Version: 1.0 (Mac OS X Mail 16.0 \(3774.500.171.1.1\)) Subject: Re: Linux choosing to swap despite having 250G of file memory available Date: Fri, 5 Apr 2024 14:49:36 +0200 In-Reply-To: Cc: linux-mm@kvack.org To: Matthew Wilcox References: X-Mailer: Apple Mail (2.3774.500.171.1.1) X-Rspam-User: X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 83D538000F X-Stat-Signature: ope1sngk8krsg3zuu45x3yooqkto5uud X-HE-Tag: 1712321389-489459 X-HE-Meta: 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 m0tte7mQ xBtfmgprBmcHD+mhIG0r3BoA+DPh9zKB4Pz3UpVeo51iPopA5YoimrBHlOZ/rHkJELZlwFGK6UAKj+nYcezzpGgkLnhkTDVvoNokdoF73RfEiZdlFi8erOal4E44Z+ifAHZhA4d7/AHnHYeeYToPkwVF4lhnWRe/Umn6u5Ar2GhP73eM= X-Bogosity: Ham, tests=bogofilter, spamicity=0.004201, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: --Apple-Mail=_471CAFCD-CCB5-449A-B97B-024D34A1D1AF Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Thanks for your response. I do understand your reply, and what your = point at. The question really that I have is if there is logical scenario where = this swapping scenario could happen. All the documentation and what I see in the source suggests that in = cases like this the file memory should be used. Thank you, Frits Hoogland > On 5 Apr 2024, at 14:34, Matthew Wilcox wrote: >=20 > On Fri, Apr 05, 2024 at 11:04:49AM +0200, Frits Hoogland wrote: >> Operating system: Red Hat Enterprise Linux 8.9 >> Kernel: 4.18.0-513.5.1.el8_9.x86_64 #1 SMP >=20 > 4.18 was released in 2018. I know Red Hat still supports it, but = really > that's up to them. You need to engage with Red Hat product support, > not upstream. We don't know what changes Red Hat have made to it that > may influence swapping behaviour. >=20 --Apple-Mail=_471CAFCD-CCB5-449A-B97B-024D34A1D1AF Content-Transfer-Encoding: 7bit Content-Type: text/html; charset=us-ascii Thanks for your response. I do understand your reply, and what your point at.

The question really that I have is if there is logical scenario where this swapping scenario could happen.
All the documentation and what I see in the source suggests that in cases like this the file memory should be used.

Thank you,

Frits Hoogland




On 5 Apr 2024, at 14:34, Matthew Wilcox <willy@infradead.org> wrote:

On Fri, Apr 05, 2024 at 11:04:49AM +0200, Frits Hoogland wrote:
Operating system: Red Hat Enterprise Linux 8.9
Kernel: 4.18.0-513.5.1.el8_9.x86_64 #1 SMP

4.18 was released in 2018.  I know Red Hat still supports it, but really
that's up to them.  You need to engage with Red Hat product support,
not upstream.  We don't know what changes Red Hat have made to it that
may influence swapping behaviour.


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