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From: Kent Overstreet To: David Wang <00107082@163.com> Cc: Suren Baghdasaryan , akpm@linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] alloc_tag: avoid mem alloc and iter reset when reading allocinfo Message-ID: References: <289b58f1.352d.196addbf31d.Coremail.00107082@163.com> <1ed4c8f7.3e12.196adf621a2.Coremail.00107082@163.com> <52tsrapmkfywv4kkdpravtfmxkhxchyua4wttpugihld4iws3r@atfgtbd5wwhx> <7bf1ee37.b6a4.196b0b6dce1.Coremail.00107082@163.com> <5294252d.b74a.196b0d583c6.Coremail.00107082@163.com> <64e0d38f.b791.196b0e73c9d.Coremail.00107082@163.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <64e0d38f.b791.196b0e73c9d.Coremail.00107082@163.com> X-Migadu-Flow: FLOW_OUT X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 00C5E180004 X-Stat-Signature: 7388m1ydiuqyo5xmjds1pawrt6humw3o X-Rspam-User: X-HE-Tag: 1746725189-497609 X-HE-Meta: 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 4RVopc6+ PpvztOik6kKKpu8GTBijfGRGDf2wt8PHS7VPcQ0/6ajfuPKg47cdAXybT+kbfVunqe0Ae1+iBNi/6XZu06PNiu/lc6lYrtm5iWV9Ksl7aDyUFcFas7eh4gSGkXVvPK36+ZYwqg9hwN7aaMN9SZTPZEpnLec/FD6ZB6Rmy2SjE8S43+vrA/mTrtll60qzAml5RorgfBUPeh6MCLtUOH8Ljt73gvFRvYjWkLexD 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 Fri, May 09, 2025 at 01:17:46AM +0800, David Wang wrote: > > The impact of accumulated iterator rewinding could be observed via: > > sudo strace -T -e read cat /proc/allocinfo > /dev/null Well, that sounds like it's worth fixing then :)