From: Mike McDonald <mikemac@mikemac.com>
Cc: "Maciej W. Rozycki" <macro@ds2.pg.gda.pl>,
linux-mips@oss.sgi.com, linux-mips@fnet.fr
Subject: Re: ll/sc emulation patch
Date: Mon, 16 Jul 2001 12:12:08 -0700 [thread overview]
Message-ID: <200107161912.MAA09606@saturn.mikemac.com> (raw)
In-Reply-To: Your message of "Mon, 16 Jul 2001 11:47:04 PDT." <200107161847.LAA09164@saturn.mikemac.com>
>To: "Maciej W. Rozycki" <macro@ds2.pg.gda.pl>
>Subject: Re: ll/sc emulation patch
>Date: Mon, 16 Jul 2001 11:47:04 -0700
>From: Mike McDonald <mikemac@mikemac.com>
>
>
>>Date: Mon, 16 Jul 2001 14:03:30 +0200 (MET DST)
>>From: "Maciej W. Rozycki" <macro@ds2.pg.gda.pl>
>>To: Ralf Baechle <ralf@oss.sgi.com>
>>Subject: Re: ll/sc emulation patch
>> I didn't profile it very extensively, yet when stracing `ls /usr/lib'
>>(fileutils 4.1 linked against glibc 2.2.3) on my system once I yielded
>>~4500 syscalls of which ~4000 were _test_and_set() (or MIPS_ATOMIC_SET,
>>depending on my kernel/glibc configuration) invocations. Yes, libpthread
>>appears to assume atomic operations are cheap, which is justifiable as
>>they are indeed, for almost every other CPU type.
>
> Not knowing anything about the glibc architecture, I have a dumb
>question: why is 'ls' doing anything at all with pthreads?
OK, let me rephrase this: why are ~90% of ls's syscalls calls to
_test_and_set() when 'ls' is(??) a single threaded program? Does glibc
always assume it's running in a multithreaded environment?
Mike McDonald
mikemac@mikemac.com
next prev parent reply other threads:[~2001-07-16 19:12 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-07-12 18:37 ll/sc emulation patch Jan-Benedict Glaw
2001-07-12 20:45 ` Ralf Baechle
2001-07-13 10:52 ` Maciej W. Rozycki
2001-07-14 10:53 ` Ralf Baechle
2001-07-14 17:19 ` Harald Koerfgen
2001-07-16 4:32 ` Jun Sun
2001-07-16 4:51 ` Ralf Baechle
2001-07-16 12:04 ` Maciej W. Rozycki
2001-07-16 10:03 ` Florian Lohoff
2001-07-16 12:03 ` Maciej W. Rozycki
2001-07-16 18:47 ` Mike McDonald
2001-07-16 18:50 ` H . J . Lu
2001-07-16 19:51 ` Maciej W. Rozycki
2001-07-16 20:09 ` H . J . Lu
2001-07-16 20:33 ` Maciej W. Rozycki
2001-07-16 20:43 ` H . J . Lu
2001-07-16 19:12 ` Mike McDonald [this message]
2001-07-16 19:40 ` Maciej W. Rozycki
2001-07-19 0:18 ` Ralf Baechle
2001-07-19 12:56 ` Maciej W. Rozycki
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