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Mon, 02 Sep 2024 20:36:04 -0700 (PDT) Received: from google.com ([2401:fa00:8f:203:43a1:71e3:7464:e91b]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-715e569dccesm7525006b3a.136.2024.09.02.20.36.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 02 Sep 2024 20:36:04 -0700 (PDT) Date: Tue, 3 Sep 2024 12:35:58 +0900 From: Sergey Senozhatsky To: alexs@kernel.org Cc: Vitaly Wool , Miaohe Lin , Andrew Morton , linux-kernel@vger.kernel.org, linux-mm@kvack.org, minchan@kernel.org, willy@infradead.org, senozhatsky@chromium.org, david@redhat.com, 42.hyeyoo@gmail.com, Yosry Ahmed , nphamcs@gmail.com Subject: Re: [PATCH v7 00/21] mm/zsmalloc: add zpdesc memory descriptor for zswap.zpool Message-ID: <20240903033558.GC9738@google.com> References: <20240902072136.578720-1-alexs@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20240902072136.578720-1-alexs@kernel.org> X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 635DE40007 X-Stat-Signature: hqgbikqg5xr9abxf1fesamn98aazo9jp X-Rspam-User: X-HE-Tag: 1725334565-183809 X-HE-Meta: U2FsdGVkX1+Pj05TC2bf/F3Bvo8hbSM5c04H9R+8xiImMAaaOSOIexcTHMKz7uYsy50LSyHmsyxA9BES0WlOBQIwwsm7a1vj53nmEPh+jnzLPhaMeNKA5WR7LpkCVFN5LRMV878VNmFltUSv6vbqiybXW+7BIxT68UPYZCUy0+q++fMarJtbBV67IuTA9asqtKLajNcaR0jnyxwrOsDjWMATqXVc42mA63yUDT/yHsEQcl0hWaav/RFfrsFd5NIqmqx0IuXc/clGaNzxQXx3YhVUN4G5TKlpXJ7m0TpkLI7rwo/eTVyzumULaE58g2/mweMAJAJ4aeWvQOh+rioEjG120ggFdCwadgrYhxDnec/2VJjCppJ9ZI2LdP01iM8GQdeiCA9/NoUp1lCd+MK1qovUrE9e9Z+gQ9EmoOK3S9az43M1biR+6CeYx3gSd5aODfbtNswckD3jJP1zMhNIZ6/gQGQuNpHEYGAebAW5BjfE+wBKCK6fISYkClg9NUbxs0gDgZivjO0Xf8AnNyn54Y1JyaTYiepeXdEe5fihgiSltmYks5KiN9eKw+ZysCnTfAFhjbsBangLG/yVPihYgbRkq0oOhy08f2rMVKFvCYrzJhTn+0GtlufFg7/dqmYWwmwSQkwDPsgbn3ZCz7SHDMblXGl9ERGr4qNYu1YQfvNPeT/u5O42EcdAR0dSlCEqGeCG/WWGCYPx+vNoRQqPvlAmYq4UAIU09D8uM6GGznYwkAdGj+iD2hcRiVXwVoEvYW7lHbHTToGQalz8/gpKVF2+a5vnI8IvI8dR9xOnciX3H7gxOLwPGDT39fFjR4lFuqokFXYQJt5M8+jl1aqg2Gy8gqRcrEe4CIMDdzAsV4lOs+mZcb6Bvx1hqgOsTPd87LCXRKaklOJ11oz37fsEVASYXx67JNJoGEuA+9OkJ0OVRvnwZWUGqloctZkTEkUQry3I+UpZr6h8EaW3ggK Q7K6RV5a jS98TGE2O7Yk/omz+R/Qi8mVZz2HT4emP4GxIlLv4Z/92qNMn9lwJG0MADymIb4keGk+fpHZn2oYfrAH+9HVFRZnWQBkpZDE6zBHhUaA5Ic27g4Q9gynTDZqCqKLQ+Z1Rb2A+x1qNR3v3PvuiL3IkkecPsci/nwbWoRMEK14O+8EOAfGnV+Nqqm398zabCXKkBNdfL6OaRbO7xehOWMwulY/f1Kno9+jud+OzY6JXgc2awi8bo79EwUbGNdSXrx7bmfz10G78nb/gnnkoMlw0GJGlgmkLNTj8XfDx6MzS3XZox3691a/zK5cp653xuVzFxso7RqdGZIUOevHpAcY6zVW3MldsEJtobFTCozneXI2SkN5sGTEwCKUc4GKKhYqZJJ3PwO5AUhHMWVOT+VIT8AICqKT+ww4ytiwiZgn1vmEibGFwQYDIb/c+npUfFes77L9FLhjaWb2JJr09MDAmTMe85w== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000018, 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 (24/09/02 15:21), alexs@kernel.org wrote: > The descriptor still overlays the struct page; nothing has changed > in that regard. > [..] > This patachset does not increase the descriptor size nor introduce any > functional changes, and could save about 122Kbytes zsmalloc.o size. Is this number accurate? Where does such a large saving come from?