Re: [Lsf-pc] [LSF/MM TOPIC] async buffered diskio read for userspace apps

From: Jens Axboe <axboe@kernel.dk>
To: Milosz Tanski <milosz@adfin.com>
Cc: James Bottomley <James.Bottomley@hansenpartnership.com>,
	Jeremy Allison <jra@samba.org>,
	Volker Lendecke <Volker.Lendecke@sernet.de>,
	Jan Kara <jack@suse.cz>, Christoph Hellwig <hch@infradead.org>,
	linux-mm@kvack.org,
	"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
	lsf-pc@lists.linux-foundation.org
Subject: Re: [Lsf-pc] [LSF/MM TOPIC] async buffered diskio read for userspace apps
Date: Wed, 21 Jan 2015 14:17:00 -0700	[thread overview]
Message-ID: <54C0174C.9060203@kernel.dk> (raw)
In-Reply-To: <CANP1eJH=-ounu9RCtWntnS4nLFVZYaUJg26AUn1=MZFCpeVFTQ@mail.gmail.com>

On 01/20/2015 04:53 PM, Milosz Tanski wrote:
> On Tue, Jan 20, 2015 at 6:30 PM, Jens Axboe <axboe@kernel.dk> wrote:
>> On 01/20/2015 04:26 PM, Jens Axboe wrote:
>>> On 01/20/2015 04:22 PM, Milosz Tanski wrote:
>>>> Side note Jens.
>>>>
>>>> Can you add a configure flag to disable use of SHM (like for ESX)? It
>>>> took me a while to figure out the proper define to manually stick in
>>>> the configure.
>>>>
>>>> The motivation for this is using rr (mozila's replay debugger) to
>>>> debug fio. rr doesn't support SHM. http://rr-project.org/ gdb's
>>>> reversible debugging is too painfully slow.
>>>
>>> Yeah definitely, that's mean that thread=1 would be a requirement,
>>> obviously. But I'd be fine with adding that flag.
>>
>> http://git.kernel.dk/?p=fio.git;a=commit;h=ba40757ed67c00b37dda3639e97c3ba0259840a4
>
> Great, thanks for fixing it so quickly. Hopefully it'll be useful to
> others as well.

No problem, it's in the 2.2.5 version as released. Let me know when you 
are comfortable with me pulling in the cifs engine.

-- 
Jens Axboe

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