From: Steven Rostedt <rostedt@goodmis.org>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Arjan van de Ven <arjan@infradead.org>,
Denis Vlasenko <vda@ilport.com.ua>, Jens Axboe <axboe@suse.de>,
linux-kernel@vger.kernel.org
Subject: Re: kmalloc without GFP_xxx?
Date: Thu, 30 Jun 2005 02:02:06 -0400 (EDT) [thread overview]
Message-ID: <Pine.LNX.4.58.0506300158100.14989@localhost.localdomain> (raw)
In-Reply-To: <1120093373.31924.39.camel@gaston>
On Thu, 30 Jun 2005, Benjamin Herrenschmidt wrote:
>
> There are cases where using spin_lock instead of _irqsave version is a
> matter of correctness. For example, the page table lock beeing always
> taking without _irq is important to let the IPIs flow.
>
There's always exceptions! ;-)
As Jörn mentioned, you don't just use spin_lock_irqsave just to keep from
thinking, which I totally agree, but most of the time I use spin_locks, it
is better to not let interrupts flow, and for this reason, I try to keep
the places that use spin_locks as short as possible, since I don't want
100ms latencies.
-- Steve
next prev parent reply other threads:[~2005-06-30 6:02 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-06-29 11:02 Denis Vlasenko
2005-06-29 11:15 ` Arjan van de Ven
2005-06-29 11:20 ` Denis Vlasenko
2005-06-29 11:37 ` Arjan van de Ven
2005-06-29 13:44 ` Steven Rostedt
2005-06-29 14:14 ` Denis Vlasenko
2005-06-29 14:23 ` Jörn Engel
2005-06-29 14:53 ` Steven Rostedt
2005-06-29 15:10 ` Jörn Engel
2005-06-29 15:48 ` Steven Rostedt
2005-06-29 15:54 ` Jörn Engel
2005-06-29 16:04 ` Steven Rostedt
2005-06-29 15:12 ` Oliver Neukum
2005-06-29 16:48 ` Timur Tabi
2005-06-29 17:22 ` Steven Rostedt
2005-06-29 17:43 ` Richard B. Johnson
2005-06-29 18:07 ` Steven Rostedt
2005-06-30 7:52 ` Denis Vlasenko
2005-06-30 8:05 ` Steven Rostedt
2005-06-30 1:02 ` Benjamin Herrenschmidt
2005-06-30 6:02 ` Steven Rostedt [this message]
2005-06-29 11:15 ` Jens Axboe
2005-06-29 11:18 ` Denis Vlasenko
2005-06-29 11:25 ` Jens Axboe
2005-06-29 20:28 Manfred Spraul
2005-06-29 20:44 Manfred Spraul
2005-06-30 5:57 ` Steven Rostedt
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