From: David Howells <dhowells@redhat.com>
To: Benjamin LaHaise <bcrl@kvack.org>
Cc: Trond Myklebust <trond.myklebust@fys.uio.no>,
Christoph Hellwig <hch@infradead.org>,
Suparna Bhattacharya <suparna@in.ibm.com>,
Andrew Morton <akpm@osdl.org>,
linux-kernel@vger.kernel.org,
Linux Filesystem Development <linux-fsdevel@vger.kernel.org>,
linux-aio@kvack.org
Subject: Re: [RFC] Add support for semaphore-like structure with support for asynchronous I/O
Date: Sat, 16 Apr 2005 12:12:08 +0100 [thread overview]
Message-ID: <17130.1113649928@redhat.com> (raw)
In-Reply-To: <20050415234213.GC11761@kvack.org>
Benjamin LaHaise <bcrl@kvack.org> wrote:
>
> What about the use of atomic operations on frv? Are they more lightweight
> than a semaphore, making for a better fastpath?
What do you mean? Atomic ops don't compare to semaphores.
On FRV atomic ops don't disable interrupts; they reserve one of the eight
conditional execution flags at compile time and that flag is cleared by entry
to an exception, thus aborting the write instruction. See:
Documentation/fujitsu/frv/atomic-ops.txt
I could try and improve the fastpath on the semaphores for FRV - and perhaps
should - but I implemented the semaphores before I'd thought of the clever way
to do atomic ops.
David
next prev parent reply other threads:[~2005-04-16 11:12 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-03-30 21:51 [RFC] Add support for semaphore-like structure with support for asynchronous I/O Trond Myklebust
2005-03-30 22:34 ` Andrew Morton
2005-03-30 23:17 ` Trond Myklebust
2005-03-30 23:44 ` Andrew Morton
2005-03-31 0:02 ` Trond Myklebust
2005-03-31 22:53 ` Trond Myklebust
2005-04-01 0:13 ` Andrew Morton
2005-04-01 1:22 ` Trond Myklebust
2005-04-01 14:12 ` Suparna Bhattacharya
2005-04-04 15:52 ` Suparna Bhattacharya
2005-04-04 16:22 ` Benjamin LaHaise
2005-04-04 17:56 ` Trond Myklebust
2005-04-05 15:46 ` Benjamin LaHaise
2005-04-06 1:20 ` Trond Myklebust
2005-04-06 5:17 ` Bill Huey
2005-04-06 5:01 ` Suparna Bhattacharya
2005-04-07 11:43 ` Christoph Hellwig
2005-04-08 22:39 ` Benjamin LaHaise
2005-04-08 23:31 ` Trond Myklebust
2005-04-10 14:08 ` Suparna Bhattacharya
2005-04-15 16:13 ` David Howells
2005-04-15 22:42 ` Trond Myklebust
2005-04-15 23:42 ` Benjamin LaHaise
2005-04-16 11:12 ` David Howells [this message]
2005-04-16 11:06 ` David Howells
2005-04-04 16:39 ` Trond Myklebust
2005-03-31 8:02 ` Nikita Danilov
2005-03-31 12:31 ` Trond Myklebust
2005-03-31 17:09 ` Nikita Danilov
2005-03-31 17:22 ` Trond Myklebust
2005-03-31 17:32 ` Trond Myklebust
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