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Tue, 26 Nov 2024 02:53:05 -0800 (PST) Received: from google.com ([2401:fa00:8f:203:7631:203f:1b91:cbb]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-7fbcc1d21d3sm8402126a12.21.2024.11.26.02.53.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 26 Nov 2024 02:53:05 -0800 (PST) Date: Tue, 26 Nov 2024 19:52:58 +0900 From: Sergey Senozhatsky To: Barry Song <21cnbao@gmail.com> Cc: akpm@linux-foundation.org, linux-mm@kvack.org, axboe@kernel.dk, bala.seshasayee@linux.intel.com, chrisl@kernel.org, david@redhat.com, hannes@cmpxchg.org, kanchana.p.sridhar@intel.com, kasong@tencent.com, linux-block@vger.kernel.org, minchan@kernel.org, nphamcs@gmail.com, ryan.roberts@arm.com, surenb@google.com, terrelln@fb.com, usamaarif642@gmail.com, v-songbaohua@oppo.com, wajdi.k.feghali@intel.com, willy@infradead.org, ying.huang@intel.com, yosryahmed@google.com, yuzhao@google.com, zhengtangquan@oppo.com, zhouchengming@bytedance.com, Sergey Senozhatsky Subject: Re: [PATCH RFC v3 0/4] mTHP-friendly compression in zsmalloc and zram based on multi-pages Message-ID: <20241126105258.GE440697@google.com> References: <20241121222521.83458-1-21cnbao@gmail.com> <20241126050917.GC440697@google.com> Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20241126050917.GC440697@google.com> On (24/11/26 14:09), Sergey Senozhatsky wrote: > > swap-out time(ms) 68711 49908 > > swap-in time(ms) 30687 20685 > > compression ratio 20.49% 16.9% I'm also sort of curious if you'd use zstd with pre-trained user dictionary [1] (e.g. based on a dump of your swap-file under most common workloads) would it give you desired compression ratio improvements (on current zram, that does single page compression). [1] https://github.com/facebook/zstd?tab=readme-ov-file#the-case-for-small-data-compression