From: Peter Zijlstra <peterz@infradead.org>
To: Waiman Long <longman@redhat.com>
Cc: Ingo Molnar <mingo@redhat.com>, Will Deacon <will.deacon@arm.com>,
Thomas Gleixner <tglx@linutronix.de>,
linux-kernel@vger.kernel.org, linux-alpha@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-c6x-dev@linux-c6x.org,
uclinux-h8-devel@lists.sourceforge.jp,
linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org,
linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org,
nios2-dev@lists.rocketboards.org, openrisc@lists.librecores.org,
linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org,
linux-sh@vger.kernel.org, sparclinux@vger.kernel.org,
linux-um@lists.infradead.org, linux-xtensa@linux-xtensa.org,
linux-arch@vger.kernel.org, x86@kernel.org,
Arnd Bergmann <arnd@arndb.de>, Borislav Petkov <bp@alien8.de>,
"H. Peter Anvin" <hpa@zytor.com>,
Davidlohr Bueso <dave@stgolabs.net>,
Linus Torvalds <torvalds@linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
Tim Chen <tim.c.chen@linux.intel.com>
Subject: Re: [PATCH v4 0/3] locking/rwsem: Rwsem rearchitecture part 0
Date: Thu, 14 Feb 2019 11:37:15 +0100 [thread overview]
Message-ID: <20190214103715.GI32494@hirez.programming.kicks-ass.net> (raw)
Message-ID: <20190214103715.O61xiyDUtFfJywghpz2Nwi_R2OMcuxbREoUd59m9Ey4@z> (raw)
In-Reply-To: <1550095217-12047-1-git-send-email-longman@redhat.com>
On Wed, Feb 13, 2019 at 05:00:14PM -0500, Waiman Long wrote:
> v4:
> - Remove rwsem-spinlock.c and make all archs use rwsem-xadd.c.
>
> v3:
> - Optimize __down_read_trylock() for the uncontended case as suggested
> by Linus.
>
> v2:
> - Add patch 2 to optimize __down_read_trylock() as suggested by PeterZ.
> - Update performance test data in patch 1.
>
> The goal of this patchset is to remove the architecture specific files
> for rwsem-xadd to make it easer to add enhancements in the later rwsem
> patches. It also removes the legacy rwsem-spinlock.c file and make all
> the architectures use one single implementation of rwsem - rwsem-xadd.c.
>
> Waiman Long (3):
> locking/rwsem: Remove arch specific rwsem files
> locking/rwsem: Remove rwsem-spinlock.c & use rwsem-xadd.c for all
> archs
> locking/rwsem: Optimize down_read_trylock()
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
with the caveat that I'm happy to exchange patch 3 back to my earlier
suggestion in case Will expesses concerns wrt the ARM64 performance of
Linus' suggestion.
next prev parent reply other threads:[~2019-02-14 10:37 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20190213220014.kxk4dGPy_-ynCjBbjBru6na4k4ZyVXKT0j8GelBVXk8@z>
2019-02-13 22:00 ` [PATCH v4 0/3] locking/rwsem: Rwsem rearchitecture part 0 Waiman Long
[not found] ` <20190213220015.1ysxH-7CNrdIFhN43HhpwNeF7RSBFoJQPWW5cLRyzjU@z>
2019-02-13 22:00 ` [PATCH v4 1/3] locking/rwsem: Remove arch specific rwsem files Waiman Long
2019-02-20 14:47 ` Will Deacon
[not found] ` <20190213220016.qVZR7YN6b7PNtJaS2f6lV0L261li-233A9oZ44nZLNQ@z>
2019-02-13 22:00 ` [PATCH v4 2/3] locking/rwsem: Remove rwsem-spinlock.c & use rwsem-xadd.c for all archs Waiman Long
[not found] ` <20190214105447.zASTVFPe_Ua4KXhT97AbvJ17RcoLI1qz6hK2MSA1RMk@z>
2019-02-14 10:54 ` Geert Uytterhoeven
[not found] ` <20190214111211.Zz4JLUBLm4iMV2I1EaQtWszvprA6uZ_UN5mNKMeBl04@z>
2019-02-14 11:12 ` Peter Zijlstra
2019-02-20 14:47 ` Will Deacon
[not found] ` <20190213220017.fPHty3eMIFui2_R0HHBvLImq4wVl1Ii36BMjgrdkIxg@z>
2019-02-13 22:00 ` [PATCH v4 3/3] locking/rwsem: Optimize down_read_trylock() Waiman Long
2019-02-21 14:14 ` Will Deacon
2019-02-22 3:28 ` Waiman Long
[not found] ` <20190214103715.O61xiyDUtFfJywghpz2Nwi_R2OMcuxbREoUd59m9Ey4@z>
2019-02-14 10:37 ` Peter Zijlstra [this message]
[not found] ` <20190214220527.h8SjKk87IPqCmzCDizURd2swYG-vJxuMv01nqE5HhNs@z>
2019-02-14 22:05 ` [PATCH v4 0/3] locking/rwsem: Rwsem rearchitecture part 0 Waiman Long
[not found] ` <20190215184056.tr5Jo05pLYv3uei7mX7dgqGahK7TOr658G27E5xdbO8@z>
2019-02-15 18:40 ` Will Deacon
[not found] ` <20190215185834.QggPIkizUhXeLJZ5LwKZ3hKEMdsrFZ-1d7B16zCNoWs@z>
2019-02-15 18:58 ` Waiman Long
2019-02-18 14:58 ` Will Deacon
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=20190214103715.GI32494@hirez.programming.kicks-ass.net \
--to=peterz@infradead.org \
--cc=akpm@linux-foundation.org \
--cc=arnd@arndb.de \
--cc=bp@alien8.de \
--cc=dave@stgolabs.net \
--cc=hpa@zytor.com \
--cc=linux-alpha@vger.kernel.org \
--cc=linux-arch@vger.kernel.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-c6x-dev@linux-c6x.org \
--cc=linux-hexagon@vger.kernel.org \
--cc=linux-ia64@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-m68k@lists.linux-m68k.org \
--cc=linux-mips@vger.kernel.org \
--cc=linux-parisc@vger.kernel.org \
--cc=linux-riscv@lists.infradead.org \
--cc=linux-s390@vger.kernel.org \
--cc=linux-sh@vger.kernel.org \
--cc=linux-um@lists.infradead.org \
--cc=linux-xtensa@linux-xtensa.org \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=longman@redhat.com \
--cc=mingo@redhat.com \
--cc=nios2-dev@lists.rocketboards.org \
--cc=openrisc@lists.librecores.org \
--cc=sparclinux@vger.kernel.org \
--cc=tglx@linutronix.de \
--cc=tim.c.chen@linux.intel.com \
--cc=torvalds@linux-foundation.org \
--cc=uclinux-h8-devel@lists.sourceforge.jp \
--cc=will.deacon@arm.com \
--cc=x86@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