linux-kernel - Re: [PATCH 1/4] SCHED: add some "wait..on

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Date:	Thu, 18 Sep 2014 16:42:22 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	NeilBrown <neilb@...e.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Trond Myklebust <trond.myklebust@...marydata.com>,
	Ingo Molnar <mingo@...hat.com>, linux-fsdevel@...r.kernel.org,
	linux-mm@...ck.org, linux-nfs@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Jeff Layton <jeff.layton@...marydata.com>
Subject: Re: [PATCH 1/4] SCHED: add some "wait..on_bit...timeout()"
 interfaces.

On Tue, Sep 16, 2014 at 03:31:35PM +1000, NeilBrown wrote:
> In commit c1221321b7c25b53204447cff9949a6d5a7ddddc
>    sched: Allow wait_on_bit_action() functions to support a timeout
> 
> I suggested that a "wait_on_bit_timeout()" interface would not meet my
> need.  This isn't true - I was just over-engineering.
> 
> Including a 'private' field in wait_bit_key instead of a focused
> "timeout" field was just premature generalization.  If some other
> use is ever found, it can be generalized or added later.
> 
> So this patch renames "private" to "timeout" with a meaning "stop
> waiting when "jiffies" reaches or passes "timeout",
> and adds two of the many possible wait..bit..timeout() interfaces:
> 
> wait_on_page_bit_killable_timeout(), which is the one I want to use,
> and out_of_line_wait_on_bit_timeout() which is a reasonably general
> example.  Others can be added as needed.
> 
> Signed-off-by: NeilBrown <neilb@...e.de>
> ---
>  include/linux/pagemap.h |    2 ++
>  include/linux/wait.h    |    5 ++++-
>  kernel/sched/wait.c     |   36 ++++++++++++++++++++++++++++++++++++
>  mm/filemap.c            |   13 +++++++++++++
>  4 files changed, 55 insertions(+), 1 deletion(-)
> 

Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>
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