From: Robert Love <rml@tech9.net>
To: yodaiken@fsmlabs.com
Cc: Andrew Morton <akpm@zip.com.au>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] only irq-safe atomic ops
Date: 23 Feb 2002 13:20:06 -0500 [thread overview]
Message-ID: <1014488408.846.806.camel@phantasy> (raw)
In-Reply-To: <20020223043815.B29874@hq.fsmlabs.com>
In-Reply-To: <3C773C02.93C7753E@zip.com.au>, <1014444810.1003.53.camel@phantasy> <3C773C02.93C7753E@zip.com.au> <1014449389.1003.149.camel@phantasy> <3C774AC8.5E0848A2@zip.com.au> <20020223043815.B29874@hq.fsmlabs.com>
On Sat, 2002-02-23 at 06:38, yodaiken@fsmlabs.com wrote:
> So without preemption in the kernel
> maybe 4 instructions: calculate cpuid, inc; all local no cache ping
> code is easy to read and understand.
>
> with preemption in the kernel
> a design problem. a slippery synchronization issue that
> involves the characteristic preemption error - code that works
> most of the time.
Or not. The topic of this thread was a micro-optimization. If we treat
the variable as anything normal requiring synchronization under SMP, any
of the standard solutions (atomic ops, etc.) work. If we want to get
fancy, we can disable preemption, use my atomic_irq ops, or just not
care.
Robert Love
next prev parent reply other threads:[~2002-02-23 18:20 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-02-23 6:13 [PATCH] only irq-safe atomic ops Robert Love
2002-02-23 6:51 ` Andrew Morton
2002-02-23 7:29 ` Robert Love
2002-02-23 7:54 ` Andrew Morton
2002-02-23 11:38 ` yodaiken
2002-02-23 18:20 ` Robert Love [this message]
2002-02-23 19:06 ` yodaiken
2002-02-23 21:57 ` Roman Zippel
2002-02-23 22:10 ` Andrew Morton
2002-02-23 22:23 ` yodaiken
2002-02-23 22:40 ` Andrew Morton
2002-02-23 22:48 ` yodaiken
2002-02-23 23:13 ` Robert Love
2002-02-23 23:45 ` Robert Love
2002-02-23 23:56 ` Andrew Morton
2002-02-24 1:05 ` yodaiken
2002-02-24 1:08 ` Robert Love
2002-02-23 22:00 ` John Levon
2002-02-23 22:43 ` yodaiken
2002-02-23 20:01 ` Stephen Lord
2002-02-23 20:27 ` Andrew Morton
2002-02-23 9:38 ` Russell King
[not found] <1014444810.1003.53.camel@phantasy.suse.lists.linux.kernel>
[not found] ` <3C773C02.93C7753E@zip.com.au.suse.lists.linux.kernel>
[not found] ` <1014449389.1003.149.camel@phantasy.suse.lists.linux.kernel>
[not found] ` <3C774AC8.5E0848A2@zip.com.au.suse.lists.linux.kernel>
[not found] ` <3C77F503.1060005@sgi.com.suse.lists.linux.kernel>
[not found] ` <3C77FB35.16844FE7@zip.com.au.suse.lists.linux.kernel>
2002-02-23 20:56 ` Andi Kleen
2002-02-23 21:06 ` Andrew Morton
2002-02-23 21:17 ` Stephen Lord
2002-02-23 21:42 ` Andrew Morton
2002-02-23 22:10 ` Stephen Lord
2002-02-23 22:34 ` Andrew Morton
2002-02-23 23:07 ` Mike Fedyk
2002-02-23 23:47 ` Andrew Morton
2002-02-25 13:02 ` Stephen Lord
2002-02-25 13:12 ` Jens Axboe
2002-02-25 13:18 ` Stephen Lord
2002-02-25 19:42 ` Andrew Morton
2002-02-25 19:45 ` Steve Lord
2002-02-25 20:05 ` Andrew Morton
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