From: David Miller <davem@davemloft.net>
To: dm@chelsio.com
Cc: linux-kernel@vger.kernel.org
Subject: Re: tasks getting stuck on mmap_sem?
Date: Tue, 17 Aug 2010 00:23:02 -0700 (PDT) [thread overview]
Message-ID: <20100817.002302.193698894.davem@davemloft.net> (raw)
In-Reply-To: <4C6A1C7C.7070004@chelsio.com>
From: Dimitris Michailidis <dm@chelsio.com>
Date: Mon, 16 Aug 2010 22:22:04 -0700
> This may be similar to the problems IA-64 had last week as a result of
> the rwsem changes, eg see commit
> 01d69a82e1d3c938da16bf55aab000672243aa24. I see
> arch/sparc/include/asm/atomic_64.h uses ints with atomic64_t, which
> was a problem for IA-64. Just guessing.
Well, the return types for the atomic64 routines were wrong and I
fixed that.
But our rwsem implementation on sparc64 uses a 32-bit counter so that
couldn't be the issue. And indeed I still get the problem of tasks
being stuck on rwsems even after the atomic64 return types are fixed.
But I bet that rwsem commit 424acaaeb3a3932d64a9b4bd59df6cf72c22d8f3
introduced some kind of problem in another manner. I'll try to dig
some more.
next prev parent reply other threads:[~2010-08-17 7:22 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-17 5:22 Dimitris Michailidis
2010-08-17 5:35 ` David Miller
2010-08-17 7:23 ` David Miller [this message]
-- strict thread matches above, loose matches on Subject: below --
2010-08-17 4:12 David Miller
2010-08-17 16:14 ` Linus Torvalds
2010-08-17 18:24 ` Tony Luck
2010-08-17 20:46 ` Tony Luck
2010-08-17 21:08 ` Linus Torvalds
2010-08-17 21:26 ` Tony Luck
2010-08-17 21:28 ` Linus Torvalds
2010-08-17 21:47 ` Michel Lespinasse
2010-08-17 21:59 ` David Miller
2010-08-17 23:40 ` David Miller
2010-08-17 21:44 ` David Miller
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