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b=WNY8ajYv0qRM+foPycmGOikUNp4tRrE+Tw6NNGDx/31w5/yIobbybJ5sdxXHvJlBa uHnbPPB7ojWqEDwL/JUnqMWd1Lvy3k/aF/b0N75ehjK9HDdlGX9ScCGu/2g5bkWysm lPXHIwuesy1Ws0shpvOLxl22dIPB78+XIzAg9nZg= Date: Wed, 1 Apr 2026 17:00:25 -0700 From: Andrew Morton To: zenghongling Cc: dennis@kernel.org, tj@kernel.org, cl@gentwo.org, linux-mm@kvack.org, kernel@vger.kernel.org, zhongling0719@126.com Subject: Re: [PATCH v1] mm/percpu-internal.h: optimise pcpu_chunk struct to save memory Message-Id: <20260401170025.7f54cd75ea7e69eebc2ede30@linux-foundation.org> In-Reply-To: <20260327090013.38042-1-zenghongling@kylinos.cn> References: <20260327090013.38042-1-zenghongling@kylinos.cn> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: EAD56140013 X-Stat-Signature: h4adgr5xzdh6ob1t4i4gzmr39zfht8ik X-Rspam-User: X-Rspamd-Server: rspam07 X-HE-Tag: 1775088027-864348 X-HE-Meta: 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 08AcRfnj gMUMo8KSvOr0ueEQqDym2qoUEGNrYFptqQlVuUutHdneu9x5C86wEpeiNASBSPoxHpijSLXqZlGd/KrCHj4KJHknhuNY2VESBr/oiE2475mc+3RJQIet1r2tNs2e+I6k728S25K3bVGa5bnFMi+JqTYuQi9t9Dq2WHG4U9ievxv93wTe6HX1CEypq03HlbrPpZ/Cvv9VUJdVd76nSPF/5LKrzEA2vEF4Ry17IrKTM7Zoa7yTW9xWa2YQawRlaMYGbCmwjs/7XLxG2UQcyRZpb153MSsUEkSz2SMYK5ycVAndwbhQ= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, 27 Mar 2026 17:00:13 +0800 zenghongling wrote: > Using pahole, we can see that there are some padding holes > in the current pcpu_chunk structure,Adjusting the layout of pcpu_chunk > can reduce these holes,decreasing its size from 192 bytes to 128 bytes > and eliminating a wasted cache line. Thanks. There isn't a ton of activity on this patch. I'll drop the previous version and shall set this version aside for consideration after the upcoming -rc1 release.