From: Andrew Morton <akpm@linux-foundation.org>
To: Kent Overstreet <koverstreet@google.com>
Cc: linux-kernel@vger.kernel.org, linux-aio@kvack.org,
linux-fsdevel@vger.kernel.org, zab@redhat.com, bcrl@kvack.org,
jmoyer@redhat.com, axboe@kernel.dk, viro@zeniv.linux.org.uk,
tytso@mit.edu
Subject: Re: [PATCH 13/32] wait: Add wait_event_hrtimeout()
Date: Thu, 3 Jan 2013 15:08:16 -0800 [thread overview]
Message-ID: <20130103150816.f0dda169.akpm@linux-foundation.org> (raw)
In-Reply-To: <1356573611-18590-15-git-send-email-koverstreet@google.com>
On Wed, 26 Dec 2012 17:59:51 -0800
Kent Overstreet <koverstreet@google.com> wrote:
> Analagous to wait_event_timeout() and friends, this adds
> wait_event_hrtimeout() and wait_event_interruptible_hrtimeout().
>
> Note that unlike the versions that use regular timers, these don't
> return the amount of time remaining when they return - instead, they
> return 0 or -ETIME if they timed out.
Why is this?
> +/**
> + * wait_event_hrtimeout - sleep until a condition gets true or a timeout elapses
> + * @wq: the waitqueue to wait on
> + * @condition: a C expression for the event to wait for
> + * @timeout: timeout, in jiffies
> + *
> + * The process is put to sleep (TASK_UNINTERRUPTIBLE) until the
> + * @condition evaluates to true or a signal is received.
> + * The @condition is checked each time the waitqueue @wq is woken up.
> + *
> + * wake_up() has to be called after changing any variable that could
> + * change the result of the wait condition.
> + *
> + * The function returns 0 if @condition became true, or -ETIME if the timeout
> + * elapsed.
> + */
this, methinks:
--- a/include/linux/wait.h~wait-add-wait_event_hrtimeout-fix
+++ a/include/linux/wait.h
@@ -370,7 +370,7 @@ do { \
* wait_event_hrtimeout - sleep until a condition gets true or a timeout elapses
* @wq: the waitqueue to wait on
* @condition: a C expression for the event to wait for
- * @timeout: timeout, in jiffies
+ * @timeout: timeout, as a ktime_t
*
* The process is put to sleep (TASK_UNINTERRUPTIBLE) until the
* @condition evaluates to true or a signal is received.
@@ -395,7 +395,7 @@ do { \
* wait_event_interruptible_hrtimeout - sleep until a condition gets true or a timeout elapses
* @wq: the waitqueue to wait on
* @condition: a C expression for the event to wait for
- * @timeout: timeout, in jiffies
+ * @timeout: timeout, as a ktime_t
*
* The process is put to sleep (TASK_INTERRUPTIBLE) until the
* @condition evaluates to true or a signal is received.
_
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WARNING: multiple messages have this Message-ID (diff)
From: Andrew Morton <akpm@linux-foundation.org>
To: Kent Overstreet <koverstreet@google.com>
Cc: linux-kernel@vger.kernel.org, linux-aio@kvack.org,
linux-fsdevel@vger.kernel.org, zab@redhat.com, bcrl@kvack.org,
jmoyer@redhat.com, axboe@kernel.dk, viro@zeniv.linux.org.uk,
tytso@mit.edu
Subject: Re: [PATCH 13/32] wait: Add wait_event_hrtimeout()
Date: Thu, 3 Jan 2013 15:08:16 -0800 [thread overview]
Message-ID: <20130103150816.f0dda169.akpm@linux-foundation.org> (raw)
In-Reply-To: <1356573611-18590-15-git-send-email-koverstreet@google.com>
On Wed, 26 Dec 2012 17:59:51 -0800
Kent Overstreet <koverstreet@google.com> wrote:
> Analagous to wait_event_timeout() and friends, this adds
> wait_event_hrtimeout() and wait_event_interruptible_hrtimeout().
>
> Note that unlike the versions that use regular timers, these don't
> return the amount of time remaining when they return - instead, they
> return 0 or -ETIME if they timed out.
Why is this?
> +/**
> + * wait_event_hrtimeout - sleep until a condition gets true or a timeout elapses
> + * @wq: the waitqueue to wait on
> + * @condition: a C expression for the event to wait for
> + * @timeout: timeout, in jiffies
> + *
> + * The process is put to sleep (TASK_UNINTERRUPTIBLE) until the
> + * @condition evaluates to true or a signal is received.
> + * The @condition is checked each time the waitqueue @wq is woken up.
> + *
> + * wake_up() has to be called after changing any variable that could
> + * change the result of the wait condition.
> + *
> + * The function returns 0 if @condition became true, or -ETIME if the timeout
> + * elapsed.
> + */
this, methinks:
--- a/include/linux/wait.h~wait-add-wait_event_hrtimeout-fix
+++ a/include/linux/wait.h
@@ -370,7 +370,7 @@ do { \
* wait_event_hrtimeout - sleep until a condition gets true or a timeout elapses
* @wq: the waitqueue to wait on
* @condition: a C expression for the event to wait for
- * @timeout: timeout, in jiffies
+ * @timeout: timeout, as a ktime_t
*
* The process is put to sleep (TASK_UNINTERRUPTIBLE) until the
* @condition evaluates to true or a signal is received.
@@ -395,7 +395,7 @@ do { \
* wait_event_interruptible_hrtimeout - sleep until a condition gets true or a timeout elapses
* @wq: the waitqueue to wait on
* @condition: a C expression for the event to wait for
- * @timeout: timeout, in jiffies
+ * @timeout: timeout, as a ktime_t
*
* The process is put to sleep (TASK_INTERRUPTIBLE) until the
* @condition evaluates to true or a signal is received.
_
next prev parent reply other threads:[~2013-01-03 23:08 UTC|newest]
Thread overview: 152+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-27 1:59 [PATCH 00/32] AIO performance improvements/cleanups, v3 Kent Overstreet
2012-12-27 1:59 ` Kent Overstreet
2012-12-27 1:59 ` [PATCH 01/32] mm: remove old aio use_mm() comment Kent Overstreet
2012-12-27 1:59 ` Kent Overstreet
2012-12-27 1:59 ` [PATCH 02/32] aio: remove dead code from aio.h Kent Overstreet
2012-12-27 1:59 ` Kent Overstreet
2012-12-27 1:59 ` [PATCH 03/32] gadget: remove only user of aio retry Kent Overstreet
2012-12-27 1:59 ` Kent Overstreet
2012-12-27 1:59 ` [PATCH 04/32] aio: remove retry-based AIO Kent Overstreet
2012-12-27 1:59 ` Kent Overstreet
2012-12-29 7:36 ` Hillf Danton
2012-12-29 7:36 ` Hillf Danton
2013-01-07 22:12 ` Kent Overstreet
2013-01-07 22:12 ` Kent Overstreet
2012-12-29 7:47 ` Hillf Danton
2012-12-29 7:47 ` Hillf Danton
2013-01-07 22:15 ` Kent Overstreet
2013-01-07 22:15 ` Kent Overstreet
2012-12-27 1:59 ` [PATCH 05/32] char: add aio_{read,write} to /dev/{null,zero} Kent Overstreet
2012-12-27 1:59 ` Kent Overstreet
2012-12-27 1:59 ` [PATCH 06/32] aio: Kill return value of aio_complete() Kent Overstreet
2012-12-27 1:59 ` Kent Overstreet
2012-12-27 1:59 ` [PATCH 07/32] aio: kiocb_cancel() Kent Overstreet
2012-12-27 1:59 ` Kent Overstreet
2012-12-27 1:59 ` [PATCH 08/32] aio: Move private stuff out of aio.h Kent Overstreet
2012-12-27 1:59 ` Kent Overstreet
2012-12-27 1:59 ` [PATCH 09/32] aio: dprintk() -> pr_debug() Kent Overstreet
2012-12-27 1:59 ` Kent Overstreet
2012-12-27 1:59 ` [PATCH 10/32] aio: do fget() after aio_get_req() Kent Overstreet
2012-12-27 1:59 ` Kent Overstreet
2012-12-27 1:59 ` [PATCH 11/32] aio: Make aio_put_req() lockless Kent Overstreet
2012-12-27 1:59 ` Kent Overstreet
2012-12-27 1:59 ` [PATCH 12/32] aio: Refcounting cleanup Kent Overstreet
2012-12-27 1:59 ` Kent Overstreet
2012-12-27 1:59 ` [PATCH 13/32] wait: Add wait_event_hrtimeout() Kent Overstreet
2012-12-27 1:59 ` Kent Overstreet
2012-12-27 10:37 ` Fubo Chen
2012-12-27 10:37 ` Fubo Chen
2013-01-03 23:08 ` Andrew Morton [this message]
2013-01-03 23:08 ` Andrew Morton
2013-01-08 0:09 ` Kent Overstreet
2013-01-08 0:09 ` Kent Overstreet
2012-12-27 1:59 ` [PATCH 14/32] aio: Make aio_read_evt() more efficient, convert to hrtimers Kent Overstreet
2012-12-27 1:59 ` Kent Overstreet
2013-01-03 23:19 ` Andrew Morton
2013-01-03 23:19 ` Andrew Morton
2013-01-08 0:28 ` Kent Overstreet
2013-01-08 0:28 ` Kent Overstreet
2013-01-08 1:00 ` Andrew Morton
2013-01-08 1:00 ` Andrew Morton
2013-01-08 1:28 ` Kent Overstreet
2013-01-08 1:28 ` Kent Overstreet
2012-12-27 1:59 ` [PATCH 15/32] aio: Use flush_dcache_page() Kent Overstreet
2012-12-27 1:59 ` Kent Overstreet
2012-12-27 1:59 ` [PATCH 16/32] aio: Use cancellation list lazily Kent Overstreet
2012-12-27 1:59 ` Kent Overstreet
2012-12-27 1:59 ` [PATCH 17/32] aio: Change reqs_active to include unreaped completions Kent Overstreet
2012-12-27 1:59 ` Kent Overstreet
2012-12-27 1:59 ` [PATCH 18/32] aio: Kill batch allocation Kent Overstreet
2012-12-27 1:59 ` Kent Overstreet
2012-12-27 1:59 ` [PATCH 19/32] aio: Kill struct aio_ring_info Kent Overstreet
2012-12-27 1:59 ` Kent Overstreet
2012-12-27 1:59 ` [PATCH 20/32] aio: Give shared kioctx fields their own cachelines Kent Overstreet
2012-12-27 1:59 ` Kent Overstreet
2013-01-03 23:25 ` Andrew Morton
2013-01-03 23:25 ` Andrew Morton
2013-01-07 23:48 ` Kent Overstreet
2013-01-07 23:48 ` Kent Overstreet
2012-12-27 2:00 ` [PATCH 21/32] aio: reqs_active -> reqs_available Kent Overstreet
2012-12-27 2:00 ` Kent Overstreet
2012-12-27 2:00 ` [PATCH 22/32] aio: percpu reqs_available Kent Overstreet
2012-12-27 2:00 ` Kent Overstreet
2012-12-27 2:00 ` [PATCH 23/32] Generic dynamic per cpu refcounting Kent Overstreet
2012-12-27 2:00 ` Kent Overstreet
2013-01-03 22:48 ` Andrew Morton
2013-01-03 22:48 ` Andrew Morton
2013-01-07 23:47 ` Kent Overstreet
2013-01-07 23:47 ` Kent Overstreet
2013-01-08 1:03 ` [PATCH] percpu-refcount: Sparse fixes Kent Overstreet
2013-01-08 1:03 ` Kent Overstreet
2013-01-25 0:51 ` [PATCH 23/32] Generic dynamic per cpu refcounting Tejun Heo
2013-01-25 0:51 ` Tejun Heo
2013-01-25 1:13 ` Kent Overstreet
2013-01-25 1:13 ` Kent Overstreet
2013-01-25 2:03 ` Tejun Heo
2013-01-25 2:03 ` Tejun Heo
2013-01-25 2:09 ` Tejun Heo
2013-01-25 2:09 ` Tejun Heo
2013-01-28 17:48 ` Kent Overstreet
2013-01-28 17:48 ` Kent Overstreet
2013-01-28 18:18 ` Tejun Heo
2013-01-28 18:18 ` Tejun Heo
2013-01-25 6:15 ` Rusty Russell
2013-01-28 17:53 ` Kent Overstreet
2013-01-28 17:53 ` Kent Overstreet
2013-01-28 17:59 ` Tejun Heo
2013-01-28 17:59 ` Tejun Heo
2013-01-28 18:32 ` Kent Overstreet
2013-01-28 18:32 ` Kent Overstreet
2013-01-28 18:57 ` Christoph Lameter
2013-01-28 18:57 ` Christoph Lameter
2013-02-08 14:44 ` Tejun Heo
2013-02-08 14:44 ` Tejun Heo
2013-02-08 14:49 ` Jens Axboe
2013-02-08 14:49 ` Jens Axboe
2013-02-08 17:50 ` Andrew Morton
2013-02-08 17:50 ` Andrew Morton
2013-02-08 21:27 ` Kent Overstreet
2013-02-08 21:27 ` Kent Overstreet
2013-02-11 14:21 ` Jeff Moyer
2013-02-11 14:21 ` Jeff Moyer
2013-02-08 21:17 ` Kent Overstreet
2013-02-08 21:17 ` Kent Overstreet
2012-12-27 2:00 ` [PATCH 24/32] aio: Percpu ioctx refcount Kent Overstreet
2012-12-27 2:00 ` Kent Overstreet
2012-12-27 2:00 ` [PATCH 25/32] aio: use xchg() instead of completion_lock Kent Overstreet
2012-12-27 2:00 ` Kent Overstreet
2013-01-03 23:34 ` Andrew Morton
2013-01-07 23:21 ` Kent Overstreet
2013-01-07 23:21 ` Kent Overstreet
2013-01-07 23:35 ` Andrew Morton
2013-01-07 23:35 ` Andrew Morton
2013-01-08 0:01 ` Kent Overstreet
2013-01-08 0:01 ` Kent Overstreet
2012-12-27 2:00 ` [PATCH 26/32] aio: Don't include aio.h in sched.h Kent Overstreet
2012-12-27 2:00 ` Kent Overstreet
2012-12-27 2:00 ` [PATCH 27/32] aio: Kill ki_key Kent Overstreet
2012-12-27 2:00 ` Kent Overstreet
2012-12-27 2:00 ` [PATCH 28/32] aio: Kill ki_retry Kent Overstreet
2012-12-27 2:00 ` Kent Overstreet
2012-12-27 2:00 ` [PATCH 29/32] block, aio: Batch completion for bios/kiocbs Kent Overstreet
2012-12-27 2:00 ` Kent Overstreet
2013-01-04 9:22 ` Jens Axboe
2013-01-04 9:22 ` Jens Axboe
2013-01-07 23:34 ` Kent Overstreet
2013-01-07 23:34 ` Kent Overstreet
2013-01-08 15:33 ` Jeff Moyer
2013-01-08 15:33 ` Jeff Moyer
2013-01-08 16:06 ` Kent Overstreet
2013-01-08 16:06 ` Kent Overstreet
2013-01-08 16:15 ` Jeff Moyer
2013-01-08 16:15 ` Jeff Moyer
2013-01-08 16:48 ` Kent Overstreet
2013-01-08 16:48 ` Kent Overstreet
2012-12-27 2:00 ` [PATCH 30/32] virtio-blk: Convert to batch completion Kent Overstreet
2012-12-27 2:00 ` Kent Overstreet
2012-12-27 2:00 ` [PATCH 31/32] mtip32xx: " Kent Overstreet
2012-12-27 2:00 ` Kent Overstreet
2012-12-27 2:00 ` [PATCH 32/32] aio: Smoosh struct kiocb Kent Overstreet
2012-12-27 2:00 ` Kent Overstreet
2013-01-04 9:22 ` [PATCH 00/32] AIO performance improvements/cleanups, v3 Jens Axboe
2013-01-04 9:22 ` Jens Axboe
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