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From: Robert Love <rml@tech9.net>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: mgross@unix-os.sc.intel.com, Daniel Jacobowitz <dan@debian.org>,
	Andi Kleen <ak@suse.de>,
	linux-kernel@vger.kernel.org
Subject: Re: PATCH Multithreaded core dump support for the 2.5.14 (and 15) kernel.
Date: 16 May 2002 14:24:39 -0700	[thread overview]
Message-ID: <1021584279.914.4.camel@sinai> (raw)
In-Reply-To: <E178SrT-00057L-00@the-village.bc.nu>

On Thu, 2002-05-16 at 14:32, Alan Cox wrote:
> > For this to happen that semaphore would have to held across schedule()'s.  
> > The ONLY place I've seen that in the kernel is set_CPUs_allowed + 
> > migration_thread.  
>
> The 2.5 kernel is pre-emptible.

Indeed :)

But there is plenty of places in the kernel - sans preemption - where we
sleep while holding a semaphore.  Was that the original question?  If
so, set_cpus_allowed by be one of the few _explicit_ places but we
implicitly sleep holding a semaphore all over.  Heck, we use them for
user-space synchronization.

	Robert Love


  reply	other threads:[~2002-05-16 21:25 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <59885C5E3098D511AD690002A5072D3C057B485B@orsmsx111.jf.intel.com.suse.lists.linux.kernel>
     [not found] ` <20020515120722.A17644@in.ibm.com.suse.lists.linux.kernel>
     [not found]   ` <20020515140448.C37@toy.ucw.cz.suse.lists.linux.kernel>
     [not found]     ` <200205152353.g4FNrew30146@unix-os.sc.intel.com.suse.lists.linux.kernel>
2002-05-16 12:54       ` PATCH Multithreaded core dump support for the 2.5.14 (and 15) kernel Andi Kleen
2002-05-16 14:13         ` Mark Gross
2002-05-16 17:27           ` Andi Kleen
2002-05-16 17:36             ` Daniel Jacobowitz
2002-05-16 18:08               ` Mark Gross
2002-05-16 21:32                 ` Alan Cox
2002-05-16 21:24                   ` Robert Love [this message]
2002-05-16 18:40                     ` Mark Gross
2002-05-20 15:44 Gross, Mark
  -- strict thread matches above, loose matches on Subject: below --
2002-05-17 12:26 Erich Focht
2002-05-14 16:38 Gross, Mark
2002-05-15  6:37 ` Vamsi Krishna S .
2002-05-15 14:04   ` Pavel Machek
2002-05-15 20:53     ` Mark Gross
2002-05-16 10:11       ` Pavel Machek
2002-05-13 19:17 Mark Gross
2002-05-14 15:35 ` Erich Focht

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