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Tue, 28 Jan 2025 01:38:41 -0800 (PST) Received: from google.com ([2401:fa00:8f:203:b323:d70b:a1b8:1683]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-72f8a77c550sm8953904b3a.135.2025.01.28.01.38.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 28 Jan 2025 01:38:41 -0800 (PST) Date: Tue, 28 Jan 2025 18:38:35 +0900 From: Sergey Senozhatsky To: Yosry Ahmed Cc: Andrew Morton , Minchan Kim , Johannes Weiner , Nhat Pham , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Sergey Senozhatsky Subject: Re: [RFC PATCH 5/6] zsmalloc: introduce handle mapping API Message-ID: References: <20250127080254.1302026-1-senozhatsky@chromium.org> <20250127080254.1302026-6-senozhatsky@chromium.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Stat-Signature: c3rdq8isb3o4jy3uttjod1iqoqu8oipx X-Rspam-User: X-Rspamd-Queue-Id: 570BEC0007 X-Rspamd-Server: rspam03 X-HE-Tag: 1738057123-383734 X-HE-Meta: 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 3LdinfHn oc1sAR8QgZppju701bgXrVur9+jY+0X8B4BxXDGiPB2Po+xVLwMwlLWHEc67I5C469qYeEYbHXerQ+3YSiF3mJ+Mxq5rezpwuQL8Egt52lbwGXzLwr7MxRgW542lAupz/8nIKRZaNZe4QF1QhijgqbHtj1lvOKdwtLTqB2HLdaaZNH3YVUJkJ2UJvECv1fbihpKGbP1leZjTLQS6uzt6CKfArneMFBsfUu123a8Py1hOSeZUNFjOkR1Mzp4URm+mRhYbn16gNP2Ux/UsP9TTUWGAQsPpSrQYTr+ciQyQHyc5iwXOH6JU+AWNvDab6ngWHhVLmwCB3Az7VPG/ur3Qi/BnF/FVHZ3GwmvBMFK1VcVQ8Crk= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000760, 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 (25/01/28 14:29), Sergey Senozhatsky wrote: > Maybe copy-in is just an okay thing to do. Let me try to measure. Naaah, not really okay. On our memory-pressure test (4GB device, 4 CPUs) that kmap_local thingy appears to save approx 6GB of memcpy(). CPY stats: 734954 1102903168 4926116 6566654656 There were 734954 cases when we memcpy() [object spans two pages] with accumulated size of 1102903168 bytes, and 4926116 cases when we took a shortcut via kmap_local and avoided memcpy(), with accumulated size of 6566654656 bytes. In both cases I counted only RO direction for map, and WO direction for unmap.