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Thu, 01 May 2025 16:49:13 -0700 (PDT) Received: from google.com ([2401:fa00:8f:203:7255:67a0:34ee:5b40]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-22e108fb862sm2079025ad.134.2025.05.01.16.49.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 01 May 2025 16:49:12 -0700 (PDT) Date: Fri, 2 May 2025 08:49:08 +0900 From: Sergey Senozhatsky To: Vitaly Wool Cc: Yosry Ahmed , linux-mm@kvack.org, akpm@linux-foundation.org, linux-kernel@vger.kernel.org, Nhat Pham , Shakeel Butt , Johannes Weiner , Igor Belousov , Minchan Kim , Sergey Senozhatsky Subject: Re: [PATCH v4] mm: add zblock allocator Message-ID: References: <20250412154207.2152667-1-vitaly.wool@konsulko.se> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 82EA51A0004 X-Stat-Signature: t1sr5u3f8gx3w6akseamkuxks1fujxtm X-HE-Tag: 1746143354-886683 X-HE-Meta: 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 q2WbXHv3 AOmhOrbnKL03Pgy3rXdhYPh/notZtdJxgdaulwSoVPUPxwGVLvwLH9rtEzAV8S+Z151hou6EgTNx62Kgs+CoL/fzlWrl7GpcmUvUXn+ZAlqqJS8E05Mx+OOf8zAOJQ0S6GKaAITaDHZsuZSMhX0GcZeqIgQQgfJFRWc62XE8Wr82+QLK+OuFMb7ckDadO1n+3kjm2VfntoC0C8KDsDbi88LKoRfBQ8vW5cnzE5AYdKxBCub0E0a1cDelyp/asiAFr8RMFLxkb56dF3DLlw8Q5+8z9lcCNZSF+dBoYoKHm9HWmKw3X2e+Wcl+DBVOYHgI0Hp+XS4Z6adzq+kNlOnELMSq76dpOScG3RXt8evY6iMmS7wM= 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 (25/04/23 21:53), Vitaly Wool wrote: [..] > * zsmalloc/zstd/make -j32 bzImage > real 8m0.594s > user 39m37.783s > sys 8m24.262s > Zswap: 200600 kB <-- after build completion > Zswapped: 854072 kB <-- after build completion > zswpin 309774 > zswpout 1538332 > > * zblock/zstd/make -j32 bzImage > real 7m35.546s > user 38m03.475s > sys 7m47.407s > Zswap: 250940 kB <-- after build completion > Zswapped: 870660 kB <-- after build completion > zswpin 248606 > zswpout 1277319 I'm sorry but what does this test test? That under memory pressure the kernel swaps out different pages with different compression characteristics?