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From: Yosry Ahmed To: Sergey Senozhatsky Cc: Andrew Morton , Minchan Kim , Nhat Pham , Johannes Weiner , Brian Geffon , linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCHv2] zsmalloc: make common caches global Message-ID: <3womulcsz4f4ym6cxtzdtv5sa4ijxyqwrbllmqnhdpb2pfrypz@7wcenus2wq3o> References: <20260117025406.799428-1-senozhatsky@chromium.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260117025406.799428-1-senozhatsky@chromium.org> X-Migadu-Flow: FLOW_OUT X-Rspamd-Queue-Id: 90E77120004 X-Stat-Signature: 8fe487ru8d6y5k8ibby86gtuzrj1tyuq X-Rspam-User: X-Rspamd-Server: rspam10 X-HE-Tag: 1768959461-99871 X-HE-Meta: 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 1tltYpiq DaCbUJZUcVew7fr8NrBPtgEhCfyVUIxMxFCxjc1PviU3Db0Jmn63PS9/sEhPyh0OtvZwJAXPqiIiXDMkeShrIy8FDdgir36rgLG7kubaBPTOREZebT9K5eG1a0GLl+vRPqQ9rEg2UfG6nvl+nWpBhdiM2MFkvW6hnUvXzYWN59U5Dc8HPk6CHIUbktZ6xV1HalK9cHqLAFxrjaN4bVvYQbI7DMJnRf9z4AFCLenmz78d+bjganDyIk85WEhvBZ2yDnIAP 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 Sat, Jan 17, 2026 at 11:54:05AM +0900, Sergey Senozhatsky wrote: > Currently, zsmalloc creates kmem_cache of handles and zspages > for each pool, which may be suboptimal from the memory usage > point of view (extra internal fragmentation per pool). Systems > that create multiple zsmalloc pools may benefit from shared > common zsmalloc caches. > > Make handles and zspages kmem caches global. The memory > savings depend on particular setup and data patterns and > can be found via slabinfo. > > Signed-off-by: Sergey Senozhatsky Reviewed-by: Yosry Ahmed