All of lore.kernel.org
 help / color / mirror / Atom feed
From: Gregory Haskins <ghaskins@novell.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Nick Piggin <npiggin@suse.de>,
	mingo@elte.hu, srostedt@redhat.com, linux-kernel@vger.kernel.org,
	linux-rt-users@vger.kernel.org, gregory.haskins@gmail.com,
	Russell King <rmk+lkml@arm.linux.org.uk>,
	ralf@linux-mips.org, Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH v2 3/6] sched: make double-lock-balance fair
Date: Wed, 27 Aug 2008 08:00:03 -0400	[thread overview]
Message-ID: <48B541C3.1090901@novell.com> (raw)
In-Reply-To: <1219835224.6462.81.camel@twins>

[-- Attachment #1: Type: text/plain, Size: 1020 bytes --]

Peter Zijlstra wrote:
> On Wed, 2008-08-27 at 12:56 +0200, Nick Piggin wrote:
>
>   
>> BTW. I wonder about other architectures that are of interest to -rt? Like
>> mips or arm perhaps... Any plans to implement ticket locks on those, or
>> do they not tend to be used in SMP configurations on -rt yte?
>>     
>
> I think both are starting to show more and more SMP machines, so yes,
> eventually we'll want ticket locks for them too.
>
> That said, I'm not aware of anyone working on it - I suppose we could
> poke the regular arch maintainers.. Ralf, Russell ?
>
>   
As an aside:  I have an implementation of C-based ticket lock
replacements for raw_spinlock_t that I could post.  I never posted them
because I mostly care about x86 and Nick's solution is superior there
since its hand-tuned asm.  But mine could be used in places that have
not yet written arch support but need FIFO.  I basically have it as a
config option to enable "generic fifo spinlocks" or something like that.

-Greg


[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 257 bytes --]

  parent reply	other threads:[~2008-08-27 12:02 UTC|newest]

Thread overview: 54+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-08-25 20:15 [PATCH 0/5] sched: misc rt fixes for tip/sched/devel Gregory Haskins
2008-08-25 20:15 ` [PATCH 1/5] sched: only try to push a task on wakeup if it is migratable Gregory Haskins
2008-08-25 20:15 ` [PATCH 2/5] sched: pull only one task during NEWIDLE balancing to limit critical section Gregory Haskins
2008-08-26  6:21   ` Nick Piggin
2008-08-26 11:36     ` Gregory Haskins
2008-08-27  6:41       ` Nick Piggin
2008-08-27 11:50         ` Gregory Haskins
2008-08-27 11:57           ` Nick Piggin
2008-08-25 20:15 ` [PATCH 3/5] sched: make double-lock-balance fair Gregory Haskins
2008-08-25 20:15   ` Gregory Haskins
2008-08-26  6:14   ` Nick Piggin
2008-08-26 12:23     ` Gregory Haskins
2008-08-27  6:36       ` Nick Piggin
2008-08-27 11:41         ` Gregory Haskins
2008-08-27 11:53           ` Nick Piggin
2008-08-27 12:10             ` Gregory Haskins
2008-08-25 20:15 ` [PATCH 4/5] sched: add sched_class->needs_post_schedule() member Gregory Haskins
2008-08-25 20:15 ` [PATCH 5/5] sched: create "pushable_tasks" list to limit pushing to one attempt Gregory Haskins
2008-08-26 17:34 ` [PATCH v2 0/6] Series short description Gregory Haskins
2008-08-26 17:34   ` [PATCH v2 1/6] sched: only try to push a task on wakeup if it is migratable Gregory Haskins
2008-08-26 17:34   ` [PATCH v2 2/6] sched: pull only one task during NEWIDLE balancing to limit critical section Gregory Haskins
2008-08-26 17:34     ` Gregory Haskins
2008-08-26 17:35   ` [PATCH v2 3/6] sched: make double-lock-balance fair Gregory Haskins
2008-08-27  8:21     ` Peter Zijlstra
2008-08-27  8:25       ` Peter Zijlstra
2008-08-27 10:26       ` Nick Piggin
2008-08-27 10:41         ` Peter Zijlstra
2008-08-27 10:56           ` Nick Piggin
2008-08-27 10:57             ` Nick Piggin
2008-08-27 12:03               ` Gregory Haskins
2008-08-27 11:07             ` Peter Zijlstra
2008-08-27 11:17               ` Russell King
2008-08-27 12:00               ` Gregory Haskins [this message]
2008-08-29 12:49               ` Ralf Baechle
2008-08-27 12:13             ` Gregory Haskins
2008-08-27 12:02       ` Gregory Haskins
2008-08-26 17:35   ` [PATCH v2 4/6] sched: add sched_class->needs_post_schedule() member Gregory Haskins
2008-08-26 17:35   ` [PATCH v2 5/6] plist: fix PLIST_NODE_INIT to work with debug enabled Gregory Haskins
2008-08-26 17:35   ` [PATCH v2 6/6] sched: create "pushable_tasks" list to limit pushing to one attempt Gregory Haskins
2008-08-29 13:24     ` Gregory Haskins
2008-08-26 18:16   ` [PATCH v2 0/6] sched: misc rt fixes for tip/sched/devel (was: Series short description) Gregory Haskins
2008-08-27  8:33   ` [PATCH v2 0/6] Series short description Peter Zijlstra
2008-09-04 12:54 ` [TIP/SCHED/DEVEL PATCH v3 0/6] sched: misc rt fixes Gregory Haskins
2008-09-04 12:55   ` [TIP/SCHED/DEVEL PATCH v3 1/6] sched: only try to push a task on wakeup if it is migratable Gregory Haskins
2008-09-04 12:55   ` [TIP/SCHED/DEVEL PATCH v3 2/6] sched: pull only one task during NEWIDLE balancing to limit critical section Gregory Haskins
2008-09-04 12:55     ` Gregory Haskins
2008-09-04 12:55   ` [TIP/SCHED/DEVEL PATCH v3 3/6] sched: make double-lock-balance fair Gregory Haskins
2008-09-04 12:55   ` [TIP/SCHED/DEVEL PATCH v3 4/6] sched: add sched_class->needs_post_schedule() member Gregory Haskins
2008-09-04 20:36     ` Steven Rostedt
2008-09-04 20:36       ` Gregory Haskins
2008-09-04 12:55   ` [TIP/SCHED/DEVEL PATCH v3 5/6] plist: fix PLIST_NODE_INIT to work with debug enabled Gregory Haskins
2008-09-04 12:55   ` [TIP/SCHED/DEVEL PATCH v3 6/6] sched: create "pushable_tasks" list to limit pushing to one attempt Gregory Haskins
2008-09-04 21:16     ` Steven Rostedt
2008-09-04 21:26       ` Gregory Haskins

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=48B541C3.1090901@novell.com \
    --to=ghaskins@novell.com \
    --cc=gregory.haskins@gmail.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-rt-users@vger.kernel.org \
    --cc=mingo@elte.hu \
    --cc=npiggin@suse.de \
    --cc=peterz@infradead.org \
    --cc=ralf@linux-mips.org \
    --cc=rmk+lkml@arm.linux.org.uk \
    --cc=srostedt@redhat.com \
    --cc=tglx@linutronix.de \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.