From: Michael Tokarev <mjt@tls.msk.ru>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>,
Jakub Jelinek <jakub@redhat.com>,
Ulrich Drepper <drepper@redhat.com>,
Roland McGrath <roland@redhat.com>,
Arjan van de Ven <arjan@infradead.org>,
"Randy.Dunlap" <rdunlap@xenotime.net>,
akpm@osdl.org, linux-kernel@vger.kernel.org,
libc-alpha@sourceware.org
Subject: Re: [PATCH] Use uname not sysctl to get the kernel revision
Date: Thu, 13 Jul 2006 01:33:13 +0400 [thread overview]
Message-ID: <44B56A99.2060402@tls.msk.ru> (raw)
In-Reply-To: <m1k66i8ql5.fsf@ebiederm.dsl.xmission.com>
Eric W. Biederman wrote:
[]
> Glibc just wants to know if our kernel is SMP so it can know if it is
> ok to busy wait for a bit waiting for a mutex. Or if busy waiting is
> a complete loss.
BTW, with smp-alternatives thing merged, "SMP or not" may not be that
simple question anymore.
I for one stopped compiling UP and SMP kernels for x86 since 2.6.17,
because SMP kernel works just fine on UP, including benchmarks (as
opposed to SMP kernel w/o smp-alternatives). But I don't remember
if uname shows SMP in this case or not (don't have any running UP
machine with that kernel right now).
But the thing is: smp-alternatives + cpu-hotplug changes things at
runtime...
/mjt
next prev parent reply other threads:[~2006-07-12 21:33 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-07-10 22:39 [PATCH] sysctl: Document that sys_sysctl will be removed Eric W. Biederman
2006-07-10 22:50 ` Randy.Dunlap
2006-07-11 4:10 ` Eric W. Biederman
2006-07-11 7:07 ` Arjan van de Ven
2006-07-12 16:25 ` [PATCH] Use uname not sysctl to get the kernel revision Eric W. Biederman
2006-07-12 16:50 ` Ulrich Drepper
2006-07-12 17:42 ` Eric W. Biederman
2006-07-12 23:24 ` Theodore Tso
2006-07-12 23:31 ` Andi Kleen
2006-07-13 0:12 ` Theodore Tso
2006-07-13 2:33 ` Eric W. Biederman
2006-07-13 12:15 ` Andi Kleen
2006-07-12 23:44 ` Steve Munroe
2006-07-14 18:49 ` Benjamin Herrenschmidt
2006-07-14 19:09 ` Andi Kleen
2006-07-13 0:19 ` Eric W. Biederman
2006-07-12 18:44 ` Roland McGrath
2006-07-12 19:33 ` Ulrich Drepper
2006-07-12 19:53 ` Jakub Jelinek
2006-07-12 20:09 ` H. Peter Anvin
2006-07-12 21:23 ` Eric W. Biederman
2006-07-12 21:29 ` Arjan van de Ven
2006-07-12 21:56 ` Eric W. Biederman
2006-07-12 22:01 ` Arjan van de Ven
2006-07-12 22:02 ` H. Peter Anvin
2006-07-12 22:26 ` Eric W. Biederman
2006-07-12 22:31 ` H. Peter Anvin
2006-07-12 23:07 ` Alan Cox
2006-07-12 23:19 ` H. Peter Anvin
2006-07-13 11:15 ` Alan Cox
2006-07-14 18:45 ` Benjamin Herrenschmidt
2006-07-14 19:11 ` H. Peter Anvin
2006-07-12 21:29 ` H. Peter Anvin
2006-07-12 21:33 ` Michael Tokarev [this message]
2006-07-13 5:17 ` Ulrich Drepper
2006-07-13 6:27 ` Ian Wienand
2006-07-13 14:39 ` Eric W. Biederman
2006-07-13 15:05 ` Arjan van de Ven
-- strict thread matches above, loose matches on Subject: below --
2006-07-13 5:00 Albert Cahalan
2006-07-13 5:42 ` H. Peter Anvin
2006-07-13 6:09 ` Albert Cahalan
2006-07-13 6:13 ` Albert Cahalan
2006-07-13 6:38 ` Eric W. Biederman
2006-07-13 16:15 ` Albert Cahalan
2006-07-13 16:53 ` Eric W. Biederman
2006-07-13 17:06 ` Albert Cahalan
2006-07-13 15:20 ` Eric W. Biederman
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