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From: Kent Overstreet To: Eric Biggers Cc: Lorenzo Stoakes , Christoph Hellwig , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-bcachefs@vger.kernel.org, Kent Overstreet , Andrew Morton , Uladzislau Rezki , linux-mm@kvack.org Subject: Re: [PATCH 07/32] mm: Bring back vmalloc_exec Message-ID: References: <20230509165657.1735798-1-kent.overstreet@linux.dev> <20230509165657.1735798-8-kent.overstreet@linux.dev> <20230510064849.GC1851@quark.localdomain> <20230513015752.GC3033@quark.localdomain> <20230514184325.GB9528@sol.localdomain> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20230514184325.GB9528@sol.localdomain> X-Migadu-Flow: FLOW_OUT X-Rspamd-Queue-Id: F0963A0006 X-Rspam-User: X-Rspamd-Server: rspam06 X-Stat-Signature: 9n4iydom75n1z1c1ax75n33t91keun5k X-HE-Tag: 1684129135-580590 X-HE-Meta: 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 Vok+K9w/ 7ZOi3lOZ9SWia1SnV1Auq3DoCeOzwqYiesjunc8KXRy70DbtZlL51zRzW8yru3RvLzU1uhFGGMzbzrqpAx6HynnEqVY8PLuxq8d06/JasZSxqso3hNLGNIx75g/uionSpXfDZz95lgpOP4rnnu/Sx/cYoLiibHn3Jamu5 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000022, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Sun, May 14, 2023 at 11:43:25AM -0700, Eric Biggers wrote: > I think it would also help if the generated assembly had the handling of the > fields interleaved. To achieve that, it might be necessary to interleave the C > code. No, that has negligable effect on performance - as expected, for an out of order processor. < 1% improvement. It doesn't look like this approach is going to work here. Sadly.