linux-kernel - Re: [PATCH] pipe: limit the per-user amount of pages allocated in pipes

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Date:	Sun, 10 Jan 2016 23:40:30 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:	w@....eu
Cc:	viro@...iv.linux.org.uk, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	socketpair@...il.com
Subject: Re: [PATCH] pipe: limit the per-user amount of pages allocated in pipes

Willy Tarreau wrote:
> In a shared environment, limiting to 256
> processes and 1024 FDs per process, you end up with "only" 1 GB of RAM which
> is more reasonable a on large shared system.

OK. I see no problems if we change example to something like

  With a user enforcing the FD limit to 262144, this results in
  1024 * 64kB + (26214464 - 1024) * 4kB = 1084MB.