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[73.183.52.120]) by smtp.gmail.com with ESMTPSA id d75a77b69052e-51706adc446sm72730071cf.15.2026.05.28.07.02.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 28 May 2026 07:02:04 -0700 (PDT) Date: Thu, 28 May 2026 10:02:02 -0400 From: Brian Masney To: Jonathan Corbet , Shuah Khan , Andrew Morton , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka Cc: linux-mm@kvack.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Matthew Storr Subject: Re: [PATCH] docs: mm: clarify that user_reserve_kbytes has no effect when overcommit_memory is set to 0 or 1 Message-ID: References: <20260528-mm-clarify-docs-v1-1-aa88e83b4bfd@redhat.com> MIME-Version: 1.0 In-Reply-To: <20260528-mm-clarify-docs-v1-1-aa88e83b4bfd@redhat.com> User-Agent: Mutt/2.3.1 (2026-03-20) X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: WyNbJTGBFbPzwyeaDf3RKkzuR4BRcnHFSr3jOtdDaAQ_1779976928 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-Stat-Signature: qfk98zpw84pmcsy67ur8j9pczfuy3tem X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: D8B3910001F X-Rspam-User: X-HE-Tag: 1779976930-951352 X-HE-Meta: U2FsdGVkX18RBiM3AxLcQjAz3OKhos+JzKOPpD4ItRACUwRriXYUf4TpM83hbUhLDpT1e6h13PJyvc5z0WUX/XdiibyyOGFDEBTHXYXI6pbk0X3Fplf9SycUcKqzQEh/XI5LUkEtx5C50IrrhyzNIfLgqh8OvmSqsGINjj5cEqFTKpJRDBiRgabLf+vmfPTqOaJTvaCErrGlcPQEm01FjfDnfQ+jLG/+ztMBh1RBzyBwTi4vO+vyNe+W3amcuaJORgp/2ufA4o77Gd4zEsWK40XZPjQ4wSp7/2+a31jYqF9qsILFz+A/DAO7toyZZEhSMnbfeEAQsBSMHNLVrTiJIwUwZ60uZZTLNs2axyPG3ino6EXjkR4BPKB1EKi9MTQ8fO4+C+mUsL6dvy0+1zTAdBLCgHWrwlqO9gg7OnGQPiBA7XdaWUUt1T4Ur9SGOp9vftIWyEMXlVIDgzHlTj4zSeHXK0xWZUfFo85PAEyFTVJzGCEMg7jcc2fF0SV/q4Tdzj6AjbGqAD1bYgYDXnwTI9H+hH9WmSMamVbQnV5Xts479cuMcGzdIXC34L9ZoPLaqprG/zdyPB9bNiBJg+Ydci32geLhRCBrfbOsbw03QMwEqjpsGmZtExc5Q39Bd7HfFTBa3OOaUMqifSB96j/J9kf1ln5CVr/hPB62GgRskKH8feGEVG1tdOYxIynt/xUApP4dQPZI9U2Yhn/ccHHYSvkwBpD0GezFG3dhN52X0nUB/oizeDS2UlOZ7lzfFSfv998Ef5ts3s8viQdRzUBDUFROGw6TEkzqcKFFsLizK7Rwky6/+LnON7cYuvU8jDABq4vK5RC3YO0ohfjUgukz6Y+0xJZDurYxriDveI4BcB8yJOwfJmg9PsnwOqRGxlb3v2DHBiEeo9YF7tekGrgq7nHrC9QKzZM1uhvv8PUHMBH44LggFianC3yUb3Zkdr8sFdfTfQEQ/8cwosnopoy WK1k3fFw jZ+6gBxHefu6i/LM5L9vjiCC5yzKzLX4hETgiHbDZuQ20XjsucLl4Y1iverj8ZagCivJPBfGoUw/nO0EInS6f9asaQwiE87Es1QPY652yxFVk301FnkN1Gh9deBteURu1mEnBchumSuucANR72dKKL09wsoZZjaLpJ3pLqKhv+KiMTetpjlZfBKyFVT+Ld8PnfQl7OdWEWqon8D3/tO0QOrznWl7BnziRb+Whqz5t/tGmcsmfbNrWpO3S52SKa8Z2Q2FEyk8bPMINgssdpD7Du2cwTIXnVOZR20KH3afj/z6JqcsFFHcZq5Vchj7h51lMhKjx92zuA4FTByjQGUVVwjQoSkEO89Pp0N3odLp4yI06WkPUVJ7iGKrITREkuiKXpiBlXlX/ZSv8osnYQjSJgSnGzzdP8Yhz0C+pjG/yzOuinglV4OgTW0qtxFT4AmMr3wZFBTPQnWCRNavHJ2TkSV9X0VKmCVAkrdUIFmPoh8VHdX8= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, May 28, 2026 at 09:45:10AM -0400, Brian Masney wrote: > Looking at __vm_enough_memory() in mm/util.c, user_reserve_kbytes has no > effect when overcommit_memory is set to 0 or 1. The documentation for > overcommit_memory already references user_reserve_kbytes when the flag > is set to 2. > > Let's go ahead and add a clarification to user_reserve_kbytes in vm.rst > that it has no effect when overcommit_memory is set to 0 or 1. > > Signed-off-by: Brian Masney > --- > Documentation/admin-guide/sysctl/vm.rst | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/Documentation/admin-guide/sysctl/vm.rst b/Documentation/admin-guide/sysctl/vm.rst > index 97e12359775c..b9b0c218bfb4 100644 > --- a/Documentation/admin-guide/sysctl/vm.rst > +++ b/Documentation/admin-guide/sysctl/vm.rst > @@ -1034,6 +1034,8 @@ min(3% of current process size, user_reserve_kbytes) of free memory. > This is intended to prevent a user from starting a single memory hogging > process, such that they cannot recover (kill the hog). > > +This setting has no effect when overcommit_memory is set to 0 or 1. > + > user_reserve_kbytes defaults to min(3% of the current process size, 128MB). > > If this is reduced to zero, then the user will be allowed to allocate > > --- > base-commit: e7d700e14934e68f86338c5610cf2ae76798b663 > change-id: 20260528-mm-clarify-docs-76ab8f82826d + Other MM maintainers / reviewers. Sorry for not including on the initial patch posting. I initially missed the separate MM Core subsystem in the MAINTAINERS file. Brian