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Date: Tue, 19 Jan 2016 16:07:15 -0800 From: Linus Torvalds <torvalds@...ux-foundation.org> To: Willy Tarreau <w@....eu>, Al Viro <viro@...iv.linux.org.uk> Cc: Марк Коренберг <socketpair@...il.com>, Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>, linux-fsdevel <linux-fsdevel@...r.kernel.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, lkp@...el.com Subject: Re: [PATCH v4] pipe: limit the per-user amount of pages allocated in pipes On Mon, Jan 18, 2016 at 7:36 AM, Willy Tarreau <w@....eu> wrote: > On no-so-small systems, it is possible for a single process to cause an > OOM condition by filling large pipes with data that are never read. A > typical process filling 4000 pipes with 1 MB of data will use 4 GB of > memory. On small systems it may be tricky to set the pipe max size to > prevent this from happening. > > This patch makes it possible to enforce a per-user soft limit above > which new pipes will be limited to a single page, effectively limiting > them to 4 kB each, as well as a hard limit above which no new pipes may > be created for this user. T Al, should I take this directly, or is it coming through your tree? Linus
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