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Wed, 05 Aug 2026 03:37:42 -0700 (PDT) Received: from google.com ([2a00:79e0:2031:6:8002:2a47:a704:5a58]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-38febfdae56sm4428181a91.2.2026.08.05.03.37.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 05 Aug 2026 03:37:41 -0700 (PDT) Date: Wed, 5 Aug 2026 19:37:37 +0900 From: Sergey Senozhatsky To: Barry Song Cc: Sergey Senozhatsky , akpm@linux-foundation.org, bigeasy@linutronix.de, hdanton@sina.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, minchan@kernel.org, ryncsn@gmail.com, yosry.ahmed@linux.dev, surenb@google.com, Dongdong Zhang , Suleiman Souhlal Subject: Re: [RFC PATCH] zram: avoid preemption with CPU-based compression backends Message-ID: References: <20260805005545.66112-1-baohua@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@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: On (26/08/05 18:34), Barry Song wrote: > Thanks very much for your quick patch, Sergey. > > We are going to run three experiments: > > 1. Use the approach I just sent, which avoids calling zs_malloc() > with direct reclaim while holding the mutex, and extend it to > the other zs_malloc() call sites: > > https://lore.kernel.org/all/20260805100740.71994-1-baohua@kernel.org/ > > 2. Experiment 1 plus preemption disabled. > > 3. Your patch, which separates the compression and decompression > mutexes. > > I'd like to understand which change has the biggest impact on > performance. > > Let me gather some data, and I'll get back to you. Thanks a lot! Take your time!