From: Martin Wilck <mwilck@suse.com>
To: Andy Grover <agrover@redhat.com>,
dm-devel@redhat.com, snitzer@redhat.com
Cc: mpatocka@redhat.com
Subject: Re: [PATCH 1/3] dm: a basic support for using the select or poll function
Date: Thu, 11 May 2017 11:39:39 +0200 [thread overview]
Message-ID: <1494495579.6093.10.camel@suse.com> (raw)
In-Reply-To: <20170509191028.6898-2-agrover@redhat.com>
On Tue, 2017-05-09 at 12:10 -0700, Andy Grover wrote:
> From: Mikulas Patocka <mpatocka@redhat.com>
>
> This is the very simple patch for polling on the /dev/mapper/control
> device. The select or poll function waits until any event happens on
> any
> dm device since opening the /dev/mapper/control device. When select
> or
> poll returns the device as readable, we must close and reopen the
> device
> to wait for new dm events.
Why have you done it that way? Couldn't you just save the
dm_global_event_nr at the time poll() is called?
Regards
Martin
--
Dr. Martin Wilck <mwilck@suse.com>, Tel. +49 (0)911 74053 2107SUSE
Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham NortonHRB
21284 (AG Nürnberg)
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next prev parent reply other threads:[~2017-05-11 9:39 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-09 19:10 [PATCH 0/3] poll()able DM events Andy Grover
2017-05-09 19:10 ` [PATCH 1/3] dm: a basic support for using the select or poll function Andy Grover
2017-05-11 9:39 ` Martin Wilck [this message]
2017-05-11 9:43 ` Martin Wilck
2017-05-11 13:21 ` Mike Snitzer
2017-05-11 18:10 ` Andy Grover
2017-05-11 19:49 ` Martin Wilck
2017-05-11 20:21 ` Alasdair G Kergon
2017-05-11 20:45 ` Martin Wilck
2017-05-11 21:38 ` Alasdair G Kergon
2017-05-11 19:30 ` Martin Wilck
2017-05-11 21:46 ` Andy Grover
2017-05-12 6:48 ` Martin Wilck
2017-05-11 21:50 ` Alasdair G Kergon
2017-05-12 15:52 ` Mikulas Patocka
2017-05-09 19:10 ` [PATCH 2/3] dm-ioctl: add a new DM_DEV_ARM_POLL ioctl Andy Grover
2017-05-09 19:10 ` [PATCH 3/3] dm-ioctl: report event number in DM_LIST_DEVICES Andy Grover
2017-05-09 21:14 ` [PATCH 0/3] poll()able DM events Mike Snitzer
2017-09-17 2:41 ` [PATCH 3/3] dm-ioctl: report event number in DM_LIST_DEVICES Eugene Syromiatnikov
2017-09-19 16:47 ` Andy Grover
2017-09-20 11:29 ` [PATCH] dm-ioctl: fix alignment of event number in the device list Mikulas Patocka
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