From: Peter Zijlstra <peterz@infradead.org>
To: Linus Torvalds <torvalds@linux-foundation.org>,
Ingo Molnar <mingo@kernel.org>
Cc: Andi Kleen <ak@linux.intel.com>, Peter Anvin <hpa@zytor.com>,
Mike Galbraith <bitbucket@online.de>,
Thomas Gleixner <tglx@linutronix.de>,
Arjan van de Ven <arjan@linux.intel.com>,
linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
Peter Zijlstra <peterz@infradead.org>
Subject: [RFC][PATCH 0/5] preempt_count rework
Date: Wed, 14 Aug 2013 15:15:39 +0200 [thread overview]
Message-ID: <20130814131539.790947874@chello.nl> (raw)
These patches optimize preempt_enable by firstly folding the preempt and
need_resched tests into one -- this should work for all architectures. And
secondly by providing per-arch preempt_count implementations; with x86 using
per-cpu preempt_count for fastest access.
These patches have so far only been compiled for defconfig-x86_64 +
CONFIG_PREEMPT=y and boot tested with kvm -smp 4 upto wanting to mount root.
It still needs asm volatile("call preempt_schedule": : :"memory"); as per
Andi's other patches to avoid the C calling convention cluttering the
preempt_enable() sites.
---
arch/alpha/include/asm/Kbuild | 1 +
arch/arc/include/asm/Kbuild | 1 +
arch/arm/include/asm/Kbuild | 1 +
arch/arm64/include/asm/Kbuild | 1 +
arch/avr32/include/asm/Kbuild | 1 +
arch/blackfin/include/asm/Kbuild | 1 +
arch/c6x/include/asm/Kbuild | 1 +
arch/cris/include/asm/Kbuild | 1 +
arch/frv/include/asm/Kbuild | 1 +
arch/h8300/include/asm/Kbuild | 1 +
arch/hexagon/include/asm/Kbuild | 1 +
arch/ia64/include/asm/Kbuild | 1 +
arch/m32r/include/asm/Kbuild | 1 +
arch/m68k/include/asm/Kbuild | 1 +
arch/metag/include/asm/Kbuild | 1 +
arch/microblaze/include/asm/Kbuild | 1 +
arch/mips/include/asm/Kbuild | 1 +
arch/mn10300/include/asm/Kbuild | 1 +
arch/openrisc/include/asm/Kbuild | 1 +
arch/parisc/include/asm/Kbuild | 1 +
arch/powerpc/include/asm/Kbuild | 1 +
arch/s390/include/asm/Kbuild | 1 +
arch/score/include/asm/Kbuild | 1 +
arch/sh/include/asm/Kbuild | 1 +
arch/sparc/include/asm/Kbuild | 1 +
arch/tile/include/asm/Kbuild | 1 +
arch/um/include/asm/Kbuild | 1 +
arch/unicore32/include/asm/Kbuild | 1 +
arch/x86/include/asm/thread_info.h | 5 ++---
arch/x86/kernel/asm-offsets.c | 1 -
arch/x86/kernel/cpu/common.c | 5 +++++
arch/x86/kernel/entry_32.S | 7 ++-----
arch/x86/kernel/entry_64.S | 4 +---
arch/x86/kernel/process_32.c | 10 ++++++++++
arch/x86/kernel/process_64.c | 10 ++++++++++
arch/xtensa/include/asm/Kbuild | 1 +
include/linux/preempt.h | 49 ++++++++++++++++++++++++++++++++++++++-----------
include/linux/sched.h | 2 +-
include/linux/thread_info.h | 1 +
include/trace/events/sched.h | 2 +-
init/main.c | 2 +-
kernel/context_tracking.c | 3 +--
kernel/cpu/idle.c | 10 ++++++++++
kernel/sched/core.c | 31 +++++++++++++++++++------------
kernel/softirq.c | 4 ++--
kernel/timer.c | 8 ++++----
lib/smp_processor_id.c | 3 +--
47 files changed, 138 insertions(+), 48 deletions(-)
next reply other threads:[~2013-08-14 13:35 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-14 13:15 Peter Zijlstra [this message]
2013-08-14 13:15 ` [RFC][PATCH 1/5] sched: Introduce preempt_count accessor functions Peter Zijlstra
2013-08-14 13:15 ` [RFC][PATCH 2/5] sched: Add NEED_RESCHED to the preempt_count Peter Zijlstra
2013-08-14 13:15 ` [RFC][PATCH 3/5] sched, arch: Create asm/preempt.h Peter Zijlstra
2013-08-14 13:15 ` [RFC][PATCH 4/5] sched: Create more preempt_count accessors Peter Zijlstra
2013-08-14 13:15 ` [RFC][PATCH 5/5] sched, x86: Provide a per-cpu preempt_count implementation Peter Zijlstra
2013-08-14 13:47 ` [RFC][PATCH 0/5] preempt_count rework H. Peter Anvin
2013-08-14 15:39 ` Mike Galbraith
2013-08-14 15:43 ` H. Peter Anvin
2013-08-15 9:01 ` Mike Galbraith
2013-08-14 16:06 ` Peter Zijlstra
2013-08-14 16:14 ` H. Peter Anvin
2013-08-14 16:52 ` Peter Zijlstra
2013-08-14 16:58 ` H. Peter Anvin
2013-08-14 16:04 ` Peter Zijlstra
2013-08-14 17:31 ` Peter Zijlstra
2013-08-14 16:48 ` Andi Kleen
2013-08-14 16:55 ` Peter Zijlstra
2013-08-14 17:12 ` Andi Kleen
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=20130814131539.790947874@chello.nl \
--to=peterz@infradead.org \
--cc=ak@linux.intel.com \
--cc=arjan@linux.intel.com \
--cc=bitbucket@online.de \
--cc=hpa@zytor.com \
--cc=linux-arch@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@kernel.org \
--cc=tglx@linutronix.de \
--cc=torvalds@linux-foundation.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