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Mon, 12 Oct 2026 21:02:58 -0700 (PDT) Received: from google.com ([2a00:79e0:2031:6:476:d384:7c2e:1579]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3ab3371f748sm11618699a91.1.2026.10.12.21.02.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 12 Oct 2026 21:02:56 -0700 (PDT) Date: Tue, 13 Oct 2026 13:02:52 +0900 From: Sergey Senozhatsky To: Bo Zhang Cc: senozhatsky@chromium.org, baohua@kernel.org, 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, suleiman@google.com, zhangdongdong5@xiaomi.com Subject: Re: [RFC PATCH] zram: avoid preemption with CPU-based compression backends Message-ID: References: <20261012123328.1138059-1-zhangbo56@xiaomi.com> 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: <20261012123328.1138059-1-zhangbo56@xiaomi.com> Hi, On (26/10/12 20:33), Bo Zhang wrote: > On (26/08/05 19:25), Sergey Senozhatsky wrote: > > quick and dirty patch. Just curious if this improves anything on your > > side. > > Hi Sergey, Barry, > > I ran an A/B of the three approaches on a real Android device > (MemTotal ~7.7GB, zram ~8GB). Same workload for all three: cycle 20 > memory-heavy apps through fg/bg to force swap-out/in, 8 rounds (~550s). > The stream mutex is instrumented with a trylock-based counter; the > measurement code is identical across all three builds, so the only > difference is the patch. Yeah, that patch was too quick and too dirty. We have significantly reworked it in [1], specifically patches 9 and 10. [1] https://lore.kernel.org/linux-kernel/20261013035201.2809924-1-senozhatsky@chromium.org