From: Jamie Lokier <jamie@shareable.org>
To: Linus Torvalds <torvalds@osdl.org>
Cc: Albert Cahalan <albert@users.sourceforge.net>,
Ulrich Drepper <drepper@redhat.com>,
Mikael Pettersson <mikpe@csd.uu.se>,
Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Who changed /proc/<pid>/ in 2.6.0-test5-bk9?
Date: Fri, 3 Oct 2003 03:53:38 +0100 [thread overview]
Message-ID: <20031003025338.GA15089@mail.shareable.org> (raw)
In-Reply-To: <Pine.LNX.4.44.0310021720510.7833-100000@home.osdl.org>
Linus Torvalds wrote:
> And it may or may not make sense to not have a "/proc/<nn>/task/<yy>/fd"
> directory at all if the thread shares file descriptors with the thread
> group leader. That would be a fairly easy optimization.
If you make /proc/.../fd return the same inode numbers for the
identical file descriptor tables, that would be just as good for fuser
performance.
fuser would stat() each of the /proc/<nn>/task/<yy>/fd entries and see
that they're the same as the group leader.
It is the same number of operations as checking for the non-existence
of /proc/<nn>/task/<yy>/fd entries, but more flexible.
Alternatively you could make the task fd directories be symbolic
links to the group leader fd directory.
-- Jamie
next prev parent reply other threads:[~2003-10-03 2:54 UTC|newest]
Thread overview: 94+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-09-28 1:27 Linux 2.6.0-test6 Linus Torvalds
2003-09-28 7:03 ` Con Kolivas
2003-09-28 10:02 ` Rob Landley
2003-09-29 4:55 ` Nick Piggin
2003-09-29 7:35 ` Rob Landley
2003-09-29 16:55 ` Ed Sweetman
2003-09-30 0:03 ` Nick Piggin
2003-10-02 0:41 ` Pedro Larroy
2003-10-02 3:05 ` Nick Piggin
2003-10-02 19:07 ` Pedro Larroy
2003-10-03 0:07 ` Nick Piggin
2003-10-03 19:34 ` Pedro Larroy
2003-09-29 18:45 ` bill davidsen
2003-09-30 1:12 ` Nick Piggin
2003-10-01 21:13 ` bill davidsen
2003-10-02 2:45 ` Nick Piggin
2003-09-28 8:26 ` Markus Hästbacka
2003-09-28 10:54 ` Jeff Garzik
2003-09-28 8:59 ` keyboard repeat / sound [was Re: Linux 2.6.0-test6] Roger Luethi
2003-09-29 15:16 ` Vojtech Pavlik
2003-09-30 7:50 ` Paul
2003-09-30 12:51 ` Vojtech Pavlik
2003-09-30 13:21 ` Aristeu Sergio Rozanski Filho
2003-09-30 13:44 ` Vojtech Pavlik
2003-09-30 14:05 ` Aristeu Sergio Rozanski Filho
2003-09-30 14:16 ` Vojtech Pavlik
2003-10-01 23:51 ` Aristeu Sergio Rozanski Filho
2003-09-30 18:16 ` Mark W. Alexander
2003-10-01 23:52 ` Aristeu Sergio Rozanski Filho
2003-09-28 10:09 ` Linux 2.6.0-test6 Rafał 'rmrmg' Roszak
2003-09-28 11:05 ` Andreas Jellinghaus
2003-09-28 12:34 ` Dave Jones
2003-09-28 16:12 ` Andreas Jellinghaus
2003-09-28 17:51 ` Andries Brouwer
2003-09-28 16:42 ` Ivan Gyurdiev
2003-09-28 20:26 ` [patch] 2.6.0-test6: correct hdlcdrv.h prototypes Adrian Bunk
2003-09-29 13:23 ` Linux 2.6.0-test6 Florin Iucha
2003-09-29 13:55 ` Muli Ben-Yehuda
2003-09-29 14:01 ` Jaroslav Kysela
2003-09-29 14:18 ` Muli Ben-Yehuda
2003-09-29 19:04 ` bill davidsen
2003-09-29 14:30 ` Takashi Iwai
2003-09-29 13:58 ` Jaroslav Kysela
2003-09-29 16:30 ` Linux 2.6.0-test6 (compile statistics) John Cherry
2003-09-29 17:44 ` Jesper Juhl
2003-10-06 20:39 ` John Cherry
2003-10-01 8:58 ` Who changed /proc/<pid>/ in 2.6.0-test5-bk9? Mikael Pettersson
2003-10-01 11:52 ` John Levon
2003-10-01 20:21 ` bill davidsen
2003-10-02 1:00 ` John Levon
2003-10-06 3:01 ` bill davidsen
2003-10-01 15:11 ` Linus Torvalds
2003-10-01 20:58 ` bill davidsen
2003-10-01 23:42 ` Albert Cahalan
2003-10-02 0:38 ` Linus Torvalds
2003-10-02 0:57 ` Albert Cahalan
2003-10-02 3:35 ` Ulrich Drepper
2003-10-02 4:12 ` Albert Cahalan
2003-10-02 4:58 ` Ulrich Drepper
2003-10-02 13:48 ` Albert Cahalan
2003-10-02 17:30 ` Ulrich Drepper
2003-10-03 0:03 ` Albert Cahalan
2003-10-03 0:40 ` Linus Torvalds
2003-10-03 2:53 ` Jamie Lokier [this message]
2003-10-06 4:54 ` Mike Fedyk
2003-10-06 2:52 ` bill davidsen
2003-10-07 23:08 ` Robert White
2003-10-07 22:46 ` Robert White
2003-10-07 23:25 ` Linus Torvalds
2003-10-08 0:41 ` Robert White
2003-10-08 0:54 ` Linus Torvalds
2003-10-08 2:31 ` Robert White
2003-10-08 2:39 ` David Lang
2003-10-08 2:59 ` Robert White
2003-10-09 18:25 ` bill davidsen
2003-10-08 2:47 ` Who changed /proc/<pid>/ in 2.6.0-test5-bk9? (SIGPIPE?) Robert White
2003-10-08 2:57 ` Linus Torvalds
2003-10-08 4:01 ` Robert White
2003-10-08 4:08 ` Linus Torvalds
2003-10-08 10:47 ` Who changed /proc/<pid>/ in 2.6.0-test5-bk9? bert hubert
2003-10-08 19:12 ` Ulrich Drepper
2003-10-09 18:43 ` bill davidsen
2003-10-08 21:54 ` Robert White
2003-10-09 18:12 ` bill davidsen
2003-10-10 4:39 ` Jamie Lokier
2003-10-09 17:59 ` bill davidsen
2003-10-11 3:02 ` Here is a case that proves my previous position wrong regurading CLONE_THREAD and CLONE_FILES Robert White
2003-10-11 3:48 ` viro
2003-10-12 11:41 ` Jamie Lokier
2003-10-02 8:46 ` Who changed /proc/<pid>/ in 2.6.0-test5-bk9? Miquel van Smoorenburg
2003-10-02 22:35 ` Jamie Lokier
2003-10-02 23:43 ` Miquel van Smoorenburg
2003-10-06 2:57 ` bill davidsen
2003-10-02 3:38 ` Ulrich Drepper
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