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Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 1/4] mm: vmpressure: scale sampling window with machine size Message-ID: References: <20260715143646.15828-1-gaikwad.dcg@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Stat-Signature: 8jn65xcthm7ipqiay59dqpgmpb3q487i X-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 8B4C5140004 X-HE-Tag: 1784710386-27500 X-HE-Meta: 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 WiPxFQK/ jn1C3uJJoHFX2kRvf6M8a/+iTyY2HcmqPJ+KP6mM0RbNvoXebNJQUC+Bk9qgu9pxMK9dfMPvXkcFrdIYATYjTuYJ6JhbrfaA9/wwHma7LFxWuZQppCc99vuiR5zSx0mPXc4LrDz6YC1OGfXjGA6W2Ljipy05pyDpLWfDApPZ5pEZPt6cJYUqbDZxMq9NEE1jctjBj0DZQJS7CBZxIAwnO1+JUpcqfgP2vRE5/cjCVy3foW3+2FFmCZ9Un7sSDq0WEyCOoY07joaf84WGe173KF0EkmOtZydllvNmpNZghDQV/CzQGEs9mjG/jPstQSIlUTTMxxeAARJHAEDNTOatnlumJziwJi8TaRAu5lwOhzkvy0dayo2bhUJebDZ7zBeTsr69Nd2it3AdPA4oRCFmD16b+a+NSur2b/dphDznB8lMREi40l8rgEwq+2Q== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed, Jul 22, 2026 at 10:07:53AM +0200, Michal Hocko wrote: > On Wed 15-07-26 20:06:41, deepakraog wrote: > > The vmpressure window size was fixed at 512 pages (SWAP_CLUSTER_MAX * 16). > > Scale it at boot from total memory and CPU count using the same fls-based > > formula as vmstat per-zone thresholds, clamped between 128 and 2048 pages. > > This is not giving us any rationale why this is needed or desirable. Agreed, the series are all somewhat corrupted here (seemingly some patches missing + not sent to the same list of people, unrelated stuff in the same series, etc.). I replied to the v2 of this ([0]), in general this is essentially the same thing submitted by a previous person ([1]), and Deepak acked that ([2]) and agreed that this isn't worth pursuing. Cheers, Lorenzo [0]:https://lore.kernel.org/linux-mm/aljYxLusTzZkTfnH@lucifer/ [1]:https://lore.kernel.org/all/20260227221555.29969-1-mcq@disroot.org/ [2]:https://lore.kernel.org/all/20260716134938.42495-1-gaikwad.dcg@gmail.com/ > > -- > Michal Hocko > SUSE Labs