linuxppc-dev.lists.ozlabs.org archive mirror
 help / color / mirror / Atom feed
From: Waiman Long <longman@redhat.com>
To: Nicholas Piggin <npiggin@gmail.com>, linuxppc-dev@lists.ozlabs.org
Cc: linux-arch@vger.kernel.org,
	"Peter Zijlstra" <peterz@infradead.org>,
	"Boqun Feng" <boqun.feng@gmail.com>,
	linux-kernel@vger.kernel.org, kvm-ppc@vger.kernel.org,
	virtualization@lists.linux-foundation.org,
	"Ingo Molnar" <mingo@redhat.com>,
	"Michal Suchánek" <msuchanek@suse.de>,
	"Will Deacon" <will@kernel.org>
Subject: Re: [PATCH v4 0/6] powerpc: queued spinlocks and rwlocks
Date: Fri, 24 Jul 2020 17:11:36 -0400	[thread overview]
Message-ID: <f568c8aa-29b5-dbe9-47b8-ee12ce55cb31@redhat.com> (raw)
In-Reply-To: <20200724131423.1362108-1-npiggin@gmail.com>

On 7/24/20 9:14 AM, Nicholas Piggin wrote:
> Updated with everybody's feedback (thanks all), and more performance
> results.
>
> What I've found is I might have been measuring the worst load point for
> the paravirt case, and by looking at a range of loads it's clear that
> queued spinlocks are overall better even on PV, doubly so when you look
> at the generally much improved worst case latencies.
>
> I have defaulted it to N even though I'm less concerned about the PV
> numbers now, just because I think it needs more stress testing. But
> it's very nicely selectable so should be low risk to include.
>
> All in all this is a very cool technology and great results especially
> on the big systems but even on smaller ones there are nice gains. Thanks
> Waiman and everyone who developed it.
>
> Thanks,
> Nick
>
> Nicholas Piggin (6):
>    powerpc/pseries: move some PAPR paravirt functions to their own file
>    powerpc: move spinlock implementation to simple_spinlock
>    powerpc/64s: implement queued spinlocks and rwlocks
>    powerpc/pseries: implement paravirt qspinlocks for SPLPAR
>    powerpc/qspinlock: optimised atomic_try_cmpxchg_lock that adds the
>      lock hint
>    powerpc: implement smp_cond_load_relaxed
>
>   arch/powerpc/Kconfig                          |  15 +
>   arch/powerpc/include/asm/Kbuild               |   1 +
>   arch/powerpc/include/asm/atomic.h             |  28 ++
>   arch/powerpc/include/asm/barrier.h            |  14 +
>   arch/powerpc/include/asm/paravirt.h           |  87 +++++
>   arch/powerpc/include/asm/qspinlock.h          |  91 ++++++
>   arch/powerpc/include/asm/qspinlock_paravirt.h |   7 +
>   arch/powerpc/include/asm/simple_spinlock.h    | 288 ++++++++++++++++
>   .../include/asm/simple_spinlock_types.h       |  21 ++
>   arch/powerpc/include/asm/spinlock.h           | 308 +-----------------
>   arch/powerpc/include/asm/spinlock_types.h     |  17 +-
>   arch/powerpc/lib/Makefile                     |   3 +
>   arch/powerpc/lib/locks.c                      |  12 +-
>   arch/powerpc/platforms/pseries/Kconfig        |   9 +-
>   arch/powerpc/platforms/pseries/setup.c        |   4 +-
>   include/asm-generic/qspinlock.h               |   4 +
>   16 files changed, 588 insertions(+), 321 deletions(-)
>   create mode 100644 arch/powerpc/include/asm/paravirt.h
>   create mode 100644 arch/powerpc/include/asm/qspinlock.h
>   create mode 100644 arch/powerpc/include/asm/qspinlock_paravirt.h
>   create mode 100644 arch/powerpc/include/asm/simple_spinlock.h
>   create mode 100644 arch/powerpc/include/asm/simple_spinlock_types.h
>
That patch series looks good to me. Thanks for working on this.

For the series,

Acked-by: Waiman Long <longman@redhat.com>


  parent reply	other threads:[~2020-07-24 21:14 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-24 13:14 [PATCH v4 0/6] powerpc: queued spinlocks and rwlocks Nicholas Piggin
2020-07-24 13:14 ` [PATCH v4 1/6] powerpc/pseries: move some PAPR paravirt functions to their own file Nicholas Piggin
2020-07-24 13:14 ` [PATCH v4 2/6] powerpc: move spinlock implementation to simple_spinlock Nicholas Piggin
2020-07-24 13:14 ` [PATCH v4 3/6] powerpc/64s: implement queued spinlocks and rwlocks Nicholas Piggin
2020-07-24 13:14 ` [PATCH v4 4/6] powerpc/pseries: implement paravirt qspinlocks for SPLPAR Nicholas Piggin
2020-07-24 13:14 ` [PATCH v4 5/6] powerpc/qspinlock: optimised atomic_try_cmpxchg_lock that adds the lock hint Nicholas Piggin
2020-07-24 13:14 ` [PATCH v4 6/6] powerpc: implement smp_cond_load_relaxed Nicholas Piggin
2020-07-24 21:10   ` Waiman Long
2020-07-24 21:11 ` Waiman Long [this message]
2020-07-27  7:26 ` [PATCH v4 0/6] powerpc: queued spinlocks and rwlocks Michael Ellerman

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=f568c8aa-29b5-dbe9-47b8-ee12ce55cb31@redhat.com \
    --to=longman@redhat.com \
    --cc=boqun.feng@gmail.com \
    --cc=kvm-ppc@vger.kernel.org \
    --cc=linux-arch@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linuxppc-dev@lists.ozlabs.org \
    --cc=mingo@redhat.com \
    --cc=msuchanek@suse.de \
    --cc=npiggin@gmail.com \
    --cc=peterz@infradead.org \
    --cc=virtualization@lists.linux-foundation.org \
    --cc=will@kernel.org \
    /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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).