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b=xJ3wwrYJMLG33Dl6VGEtv5RMdGbHxPmCMHgqdradHwUZOJml1DoeRyu8DF2En5k4x WKEvyHrEXVSsMJRLctvEfk77G0BO5cPl5xxPSix9tQlfHcguFjNioAh/vhnz09RNYV W6qZDO1kcOnlKBvGUMO2uFRGQLabtx2bCxvGFpWs= Date: Thu, 11 Jul 2024 12:36:37 -0700 From: Andrew Morton To: Vlastimil Babka Cc: Mateusz Guzik , Akinobu Mita , Alexei Starovoitov , Daniel Borkmann , John Fastabend , Andrii Nakryiko , Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Christoph Lameter , David Rientjes , Roman Gushchin , Hyeonggon Yoo <42.hyeyoo@gmail.com>, linux-kernel@vger.kernel.org, bpf@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH 0/2] revert unconditional slab and page allocator fault injection calls Message-Id: <20240711123637.508e81d2b25ac8e0c9b726c0@linux-foundation.org> In-Reply-To: <20240711-b4-fault-injection-reverts-v1-0-9e2651945d68@suse.cz> References: <20240711-b4-fault-injection-reverts-v1-0-9e2651945d68@suse.cz> X-Mailer: Sylpheed 3.7.0 (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: BADC140027 X-Stat-Signature: gs7gju7qikdgc1gh7zzbgzy9zdiyug48 X-Rspamd-Server: rspam09 X-Rspam-User: X-HE-Tag: 1720726599-162552 X-HE-Meta: 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 YUO2Wqb+ l8Z8rI809FEXqiZnemHnVQnxZtK/BFJVzqibXf8d961duW/zCgI4RxBe25zpIEtDZa3cXpd8sefrc4ita4XVOPs9BVZqJqbN+QP2MViGgXOHMUtxx57EI8eVlMtvhOg+gNarYHLOKSYJ9wisakgKqGe8S6E041eKUwbdbjsklf14eZj4HBXxinTJkOWuRJachKwWypGwn2HVpvjBPFpoUV0A9NYDYW5wdTZ2dF5jzw+3qeogoUfyfJZn55jopco46AcIP+Fx0ylwQvtwwFaf3erQGSFnU2fyGesqhtUfUR6imu/vLH/PEdNlX4AwcZngllnt8N+vGOIucqIM= 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 Thu, 11 Jul 2024 18:35:29 +0200 Vlastimil Babka wrote: > These two patches largely revert commits that added function call > overhead into slab and page allocation hotpaths and that cannot be > currently disabled even though related CONFIG_ options do exist. Five years ago. I assume the overall overhead is small?