From: Jeff Moyer <jmoyer@redhat.com>
To: Alex Richman <alex.r@gblabs.co.uk>
Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: Re: Very slow SYS_io_destroy()
Date: Mon, 23 Jul 2018 11:13:38 -0400 [thread overview]
Message-ID: <x49fu0a3rz1.fsf@segfault.boston.devel.redhat.com> (raw)
In-Reply-To: <27245a6a-a827-2662-215c-05ccdff65768@gblabs.co.uk> (Alex Richman's message of "Fri, 20 Jul 2018 20:39:42 +0100")
Alex Richman <alex.r@gblabs.co.uk> writes:
> Hi,
>
> I'm seeing some weirdness with AIO, specifically SYS_io_destroy() is
> taking upwards of ~100000 microseconds (~100 miliseconds) per call.
> How long is that call expected to take? I can see from the source
Well, it waits for an RCU grace period. I would not expect that to take
100ms, though. What kernel version is this?
-Jeff
next prev parent reply other threads:[~2018-07-23 15:13 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-20 19:39 Alex Richman
2018-07-23 15:13 ` Jeff Moyer [this message]
2018-07-23 15:16 ` Alex Richman
2018-07-26 16:21 ` Pavel Machek
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