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Mon, 05 Jan 2026 20:22:51 -0800 (PST) Received: from google.com ([2a00:79e0:2031:6:f5eb:5af6:e88e:8a77]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2a3e3c3a303sm6970685ad.5.2026.01.05.20.22.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 05 Jan 2026 20:22:50 -0800 (PST) Date: Tue, 6 Jan 2026 13:22:45 +0900 From: Sergey Senozhatsky To: Sergey Senozhatsky Cc: Yosry Ahmed , Andrew Morton , Nhat Pham , Minchan Kim , Johannes Weiner , Brian Geffon , linux-kernel@vger.kernel.org, Herbert Xu , linux-mm@kvack.org Subject: Re: [RFC PATCH 2/2] zsmalloc: chain-length configuration should consider other metrics Message-ID: <7q5gqpfshnc3lfhzxughpks3fc2knw2delpm5io2oe54monydl@5isuxnjputjr> References: <20260101013814.2312147-1-senozhatsky@chromium.org> <20260101013814.2312147-3-senozhatsky@chromium.org> <5p4iyah6zlrnxpbsis32c4m5lrjj3pq7xwcugq35d2entwfai2@n2r6y3ga2ie5> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <5p4iyah6zlrnxpbsis32c4m5lrjj3pq7xwcugq35d2entwfai2@n2r6y3ga2ie5> X-Rspamd-Queue-Id: 417F88000B X-Rspamd-Server: rspam03 X-Stat-Signature: 19559ixprg75pckppo11h75tfcaffrya X-Rspam-User: X-HE-Tag: 1767673372-664943 X-HE-Meta: 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 nsBpZbO0 PF1vKYWJHpcVHXlFq2FgkGSyOHHV0l5xSUyX644p+Qj+jrPdEoQRa9ZTSpvovY5Wa6QR2pj6fn9I6Kk0MoNrQvKpqQcQ2//onP+ZZexZA3QoOKH6ueXHH0sbLqhOPlyqwPMwxdAAEUg7DoWit5HOX4cuICt/80r9CGfRv8O4hZyEnGx31Om8x4JqU7xxjnd9BufZ0p7zUnr1m/4abFi3MjQ9dIH/WdPo8PDtwP1ayHq+hCvZObfdSzTpCEkx43v8mKwNTqC6iOvFk+qTyGKhaAuxzBZY8EGzXpI9qXIujqRzbpNpGSGGWlP+f6qvf50rsG8dvqjbBWogPABat9CUQPBsLfiOyjh/Xh1O4QPTJXmJsI3HRG41721XWLcdGu/U2Y2g5 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On (26/01/06 13:20), Sergey Senozhatsky wrote: [..] > > I am not sure tbh, adding Herbert here. I remember looking at the code > > in scomp_acomp_comp_decomp() at some point, and I think it will take > > care of non-contiguous SG-lists. Not sure if that's the correct place to > > look tho. > > Ah, so it does kmap under the hood. I suppose that can work. I'm hallucinating, sorry. Yeah, let's hear from Herbert what's the direction here.