From: Kevin Hao <haokexin@gmail.com>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: linuxppc <linuxppc-dev@lists.ozlabs.org>
Subject: [PATCH v2 0/3] powerpc: use jump label for cpu/mmu_has_feature
Date: Mon, 2 Sep 2013 13:45:23 +0800 [thread overview]
Message-ID: <1378100726-32545-1-git-send-email-haokexin@gmail.com> (raw)
v2:
- Rebase on git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
since these patches have a dependence on patch 851cf6e7 (jump_label:
Split jumplabel ratelimit)
- Drop the first two patches in v1 since they are not needed due to
the patch 851cf6e7.
v1:
Inspired by Benjamin Herrenschmidt, this patch series try to reduce the
cpu/mmu feature checking overhead by using jump label. The following is
the difference of the run path of cpu_has_feature between before and after
applying these patches:
before after
addis r10,r2,1 b xxx
addi r9,r10,-2280 b xxx (This will also be omitted if the
ld r9,0(r9) feature is not set)
ld r9,16(r9)
rldicl. r8,r9,55,63
beq c000000000037c94
This patch series passed the build test for almost all the defconfig of ppc.
There does have some broken for some configs. But they are not related to this
change. This also passed allyesconfig for x86. Boot test on p2020rdb and
p5020ds boards.
Kevin Hao (3):
powerpc: move the cpu_has_feature to a separate file
powerpc: use the jump label for cpu_has_feature
powerpc: use jump label for mmu_has_feature
arch/powerpc/include/asm/cacheflush.h | 1 +
arch/powerpc/include/asm/cpufeatures.h | 41 +++++++++++++++++++++++++++++++
arch/powerpc/include/asm/cputable.h | 8 ------
arch/powerpc/include/asm/cputime.h | 1 +
arch/powerpc/include/asm/dbell.h | 1 +
arch/powerpc/include/asm/dcr-native.h | 1 +
arch/powerpc/include/asm/mman.h | 1 +
arch/powerpc/include/asm/mmu.h | 19 +++++++++++++++
arch/powerpc/include/asm/time.h | 1 +
arch/powerpc/kernel/align.c | 1 +
arch/powerpc/kernel/cputable.c | 43 +++++++++++++++++++++++++++++++++
arch/powerpc/kernel/irq.c | 1 +
arch/powerpc/kernel/process.c | 1 +
arch/powerpc/kernel/setup-common.c | 1 +
arch/powerpc/kernel/setup_32.c | 1 +
arch/powerpc/kernel/smp.c | 1 +
arch/powerpc/oprofile/op_model_rs64.c | 1 +
arch/powerpc/platforms/cell/pervasive.c | 1 +
arch/powerpc/xmon/ppc-dis.c | 1 +
19 files changed, 118 insertions(+), 8 deletions(-)
create mode 100644 arch/powerpc/include/asm/cpufeatures.h
--
1.8.3.1
next reply other threads:[~2013-09-02 5:46 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-02 5:45 Kevin Hao [this message]
2013-09-02 5:45 ` [PATCH v2 1/3] powerpc: move the cpu_has_feature to a separate file Kevin Hao
2013-09-02 5:45 ` [PATCH v2 2/3] powerpc: use the jump label for cpu_has_feature Kevin Hao
2013-11-27 2:45 ` Benjamin Herrenschmidt
2013-12-25 5:58 ` Kevin Hao
2013-09-02 5:45 ` [PATCH v2 3/3] powerpc: use jump label for mmu_has_feature Kevin Hao
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