From: David Presotto <presotto@closedmind.org>
To: 9fans@cse.psu.edu
Subject: Re: [9fans] Threads: Sewing badges of honor onto a Kernel
Date: Sat, 28 Feb 2004 08:41:09 -0500 [thread overview]
Message-ID: <240f5378b5581b3d40cce5043307530d@plan9.bell-labs.com> (raw)
In-Reply-To: <20040228105025.1a94f714.martin@parvat.com>
The overhead on fork/exec of having to copy the stack descriptors
into the forked process is pretty minimal compared to the exec.
If you are just forking without execing then getting a new
stack is what you want.
If you are forking and sharing memory twixt the two forked processes,
we do indeed take a hit every time the processes context switch
especially on the x86 where we lose the previous tlb context as
soon as we putcr3(). If the two processes shared the TLB state
(pid on mips, page table on x86) we'ld be able to avoid that.
Not having any private segments would allow us to do it.
If you are serious about caring, throw another bit into rfork
that says dump the stack segment. You'll also have to find
someplace in all architectures to hide the pointer to the
thread private memory. Add to the kernel support for sharing
the TLB state. Then measure the two and tell us how much you
saved in various programs. If its non-neglibigle, you'll
have a reason argument instead of this endless whining back
and forth.
next prev parent reply other threads:[~2004-02-28 13:41 UTC|newest]
Thread overview: 191+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-02-27 4:45 dbailey27
2004-02-27 5:05 ` Scott Schwartz
2004-02-27 5:06 ` andrey mirtchovski
2004-02-27 5:05 ` dbailey27
2004-02-27 5:26 ` Rob Pike
2004-02-27 5:37 ` dbailey27
2004-02-27 5:47 ` ron minnich
2004-02-27 7:43 ` boyd, rounin
2004-02-27 5:54 ` Rob Pike
2004-02-27 6:01 ` dbailey27
2004-02-29 21:14 ` boyd, rounin
2004-03-01 4:40 ` Kenji Okamoto
2004-02-27 5:06 ` dbailey27
2004-02-27 5:28 ` Rob Pike
2004-02-27 6:19 ` Scott Schwartz
2004-02-28 9:38 ` Bruce Ellis
2004-02-28 10:10 ` Charles Forsyth
2004-02-28 10:28 ` Bruce Ellis
2004-02-28 10:11 ` [9fans] limbo? David Tolpin
2004-02-28 10:22 ` Geoff Collyer
2004-02-28 19:27 ` Charles Forsyth
2004-02-28 21:16 ` Russ Cox
2004-02-28 13:28 ` [9fans] Threads: Sewing badges of honor onto a Kernel boyd, rounin
2004-02-29 20:59 ` boyd, rounin
2004-02-27 5:43 ` ron minnich
2004-02-27 5:50 ` George Michaelson
2004-02-27 5:59 ` ron minnich
2004-02-27 6:07 ` George Michaelson
2004-02-27 7:47 ` boyd, rounin
2004-02-27 6:20 ` [9fans] " Linus Torvalds
2004-02-27 6:31 ` dbailey27
2004-02-27 6:49 ` Linus Torvalds
2004-02-27 6:48 ` dbailey27
2004-02-27 7:04 ` Linus Torvalds
2004-02-27 7:06 ` dbailey27
2004-02-27 7:30 ` a
2004-02-27 7:49 ` dbailey27
2004-02-27 7:39 ` Lucio De Re
2004-02-27 7:57 ` Linus Torvalds
2004-02-27 8:00 ` Rob Pike
2004-02-27 8:05 ` Lucio De Re
2004-02-27 8:06 ` boyd, rounin
2004-02-27 7:47 ` Linus Torvalds
2004-02-27 7:46 ` dbailey27
2004-02-27 8:08 ` Linus Torvalds
2004-02-27 8:04 ` dbailey27
2004-02-27 8:19 ` Geoff Collyer
2004-02-27 15:28 ` Rob Pike
2004-02-27 16:57 ` Linus Torvalds
2004-02-27 8:11 ` Lucio De Re
2004-02-27 8:17 ` Rob Pike
2004-02-27 8:31 ` Lucio De Re
2004-02-27 9:46 ` Linus Torvalds
2004-02-27 8:44 ` boyd, rounin
2004-02-27 10:00 ` Linus Torvalds
2004-02-27 9:52 ` Lucio De Re
2004-02-27 10:00 ` Charles Forsyth
2004-02-27 10:07 ` Lucio De Re
2004-02-27 10:14 ` Charles Forsyth
2004-02-27 10:24 ` Lucio De Re
2004-02-27 11:40 ` C H Forsyth
2004-02-28 9:58 ` Bruce Ellis
2004-02-27 10:11 ` Linus Torvalds
2004-02-27 10:13 ` Lucio De Re
2004-02-27 10:36 ` Linus Torvalds
2004-02-27 19:07 ` Donald Brownlee
2004-02-27 7:47 ` Fco.J.Ballesteros
2004-02-27 8:04 ` boyd, rounin
2004-02-29 21:17 ` boyd, rounin
2004-02-27 7:12 ` Rob Pike
2004-02-27 7:17 ` Charles Forsyth
2004-02-27 8:01 ` boyd, rounin
2004-02-27 8:06 ` Scott Schwartz
2004-02-27 8:15 ` Rob Pike
2004-02-27 7:06 ` Lucio De Re
2004-02-27 7:53 ` boyd, rounin
2004-02-27 12:23 ` Dave Lukes
2004-02-27 16:08 ` Linus Torvalds
2004-02-27 16:39 ` Dave Lukes
2004-02-27 17:05 ` Linus Torvalds
2004-02-27 17:03 ` Fco.J.Ballesteros
2004-02-27 17:50 ` Dave Lukes
2004-02-27 18:26 ` Linus Torvalds
2004-02-27 18:27 ` matt
2004-02-27 18:39 ` andrey mirtchovski
2004-02-27 23:39 ` boyd, rounin
2004-03-01 8:44 ` Fco.J.Ballesteros
2004-03-01 8:48 ` Fco.J.Ballesteros
2004-03-01 8:59 ` Lucio De Re
2004-03-01 9:04 ` Fco.J.Ballesteros
2004-03-01 9:16 ` Kenji Okamoto
2004-03-01 9:19 ` Kenji Okamoto
2004-03-01 15:47 ` ron minnich
2004-03-01 16:23 ` lucio
2004-03-01 18:04 ` viro
2004-03-02 9:37 ` Douglas A. Gwyn
2004-03-02 10:16 ` lucio
2004-03-03 1:36 ` Kenji Okamoto
2004-03-02 1:40 ` rob pike, esq.
2004-02-27 23:20 ` boyd, rounin
2004-03-01 10:34 ` Bengt Kleberg
2004-03-01 14:40 ` Russ Cox
2004-03-01 15:17 ` boyd
2004-03-02 9:42 ` Bengt Kleberg
2004-03-02 9:53 ` Fco.J.Ballesteros
2004-03-02 14:51 ` ron minnich
2004-03-03 9:33 ` Bengt Kleberg
2004-03-03 12:59 ` ron minnich
2004-03-03 13:10 ` Fco.J.Ballesteros
2004-03-03 13:21 ` ron minnich
2004-03-04 10:00 ` Yi Li
2004-03-04 11:22 ` Fco.J.Ballesteros
2004-03-05 15:17 ` Yi Li
2004-03-03 13:38 ` rog
2004-03-03 17:57 ` a
2004-03-01 15:56 ` ron minnich
2004-03-02 9:42 ` Bengt Kleberg
2004-02-27 17:32 ` C H Forsyth
2004-02-29 21:10 ` boyd, rounin
2004-03-01 8:19 ` Charles Forsyth
2004-03-01 8:46 ` dbailey27
2004-03-01 9:34 ` David Tolpin
2004-03-01 10:02 ` Charles Forsyth
2004-03-01 10:12 ` David Tolpin
2004-03-01 10:40 ` Charles Forsyth
2004-03-01 11:56 ` David Tolpin
2004-03-01 17:29 ` rog
2004-03-02 6:38 ` 9nut
2004-03-01 19:02 ` Taj Khattra
2004-03-01 19:15 ` David Tolpin
2004-03-01 19:22 ` Joel Salomon
2004-03-01 19:43 ` David Tolpin
2004-03-01 21:07 ` Derek Fawcus
2004-03-01 21:12 ` David Tolpin
2004-03-02 2:46 ` boyd, rounin
2004-03-02 6:02 ` David Tolpin
2004-03-02 12:31 ` Bruce Ellis
2004-03-02 18:46 ` boyd, rounin
2004-03-02 12:19 ` Dick Davies
2004-03-02 18:40 ` boyd, rounin
2004-03-04 3:52 ` Martin C.Atkins
2004-03-04 9:07 ` Bruce Ellis
2004-03-01 21:15 ` Charles Forsyth
2004-03-01 21:20 ` rog
2004-03-02 2:48 ` Joel Salomon
2004-03-03 3:58 ` Martin C.Atkins
2004-03-01 9:36 ` Geoff Collyer
2004-03-01 12:06 ` boyd
2004-03-01 14:55 ` David Presotto
2004-03-01 12:18 ` boyd
2004-03-01 13:29 ` Fco.J.Ballesteros
2004-03-01 13:33 ` lucio
2004-03-01 13:55 ` boyd
2004-03-02 4:13 ` Taj Khattra
2004-03-02 4:34 ` Roman Shaposhnick
2004-03-02 4:47 ` ron minnich
2004-03-02 5:53 ` Roman Shaposhnick
2004-03-02 5:58 ` ron minnich
2004-03-02 15:49 ` boyd, rounin
2004-03-02 7:00 ` rob pike, esq.
2004-03-02 20:58 ` Andrew Simmons
2004-03-02 21:23 ` boyd, rounin
2004-03-03 7:05 ` Anastasopoulos S
2004-03-03 5:11 ` Kenji Okamoto
2004-03-03 5:26 ` boyd, rounin
2004-03-03 9:49 ` Bruce Ellis
2004-03-03 12:41 ` boyd, rounin
2004-03-03 9:42 ` Bruce Ellis
2004-03-03 7:55 ` 9nut
2004-02-27 6:59 ` Donald Brownlee
2004-02-27 7:49 ` boyd, rounin
2004-02-27 10:11 ` [9fans] " Douglas A. Gwyn
2004-02-28 5:20 ` Martin C.Atkins
2004-02-28 9:44 ` Nigel Roles
2004-02-28 11:08 ` viro
2004-02-28 13:40 ` Nigel Roles
2004-02-28 13:36 ` boyd, rounin
2004-02-28 14:14 ` viro
2004-02-28 18:16 ` Nigel Roles
2004-02-28 18:53 ` viro
2004-02-28 19:44 ` Charles Forsyth
2004-02-28 20:13 ` Rob Pike
2004-03-01 11:50 ` viro
2004-03-01 11:49 ` dbailey27
2004-02-28 13:32 ` boyd, rounin
2004-03-01 10:35 ` Douglas A. Gwyn
2004-03-01 11:01 ` Geoff Collyer
2004-03-01 19:13 ` Joel Salomon
2004-03-01 10:35 ` Douglas A. Gwyn
2004-02-28 13:41 ` David Presotto [this message]
2004-03-02 21:59 Keith Nash
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