linux/arch/arm
Wang Nan 1879445dfa perf/core: Set event's default ::overflow_handler()
Set a default event->overflow_handler in perf_event_alloc() so don't
need to check event->overflow_handler in __perf_event_overflow().
Following commits can give a different default overflow_handler.

Initial idea comes from Peter:

  http://lkml.kernel.org/r/20130708121557.GA17211@twins.programming.kicks-ass.net

Since the default value of event->overflow_handler is not NULL, existing
'if (!overflow_handler)' checks need to be changed.

is_default_overflow_handler() is introduced for this.

No extra performance overhead is introduced into the hot path because in the
original code we still need to read this handler from memory. A conditional
branch is avoided so actually we remove some instructions.

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: <pi3orama@163.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: He Kuang <hekuang@huawei.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: Zefan Li <lizefan@huawei.com>
Link: http://lkml.kernel.org/r/1459147292-239310-3-git-send-email-wangnan0@huawei.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-03-31 10:30:47 +02:00
..
boot ARM: SoC fixes 2016-03-11 12:35:54 -08:00
common ARM: 8519/1: ICST: try other dividends than 1 2016-02-11 14:12:33 +00:00
configs fbdev fixes for v4.5 2016-02-12 09:39:34 -08:00
crypto arm/arm64: crypto: assure that ECB modes don't require an IV 2016-02-15 15:48:29 +00:00
firmware
include Merge branch 'mm-readonly-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-03-14 16:58:50 -07:00
kernel perf/core: Set event's default ::overflow_handler() 2016-03-31 10:30:47 +02:00
kvm Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-03-14 19:14:06 -07:00
lib arm, thp: remove infrastructure for handling splitting PMDs 2016-01-15 17:56:32 -08:00
mach-alpine
mach-asm9260
mach-at91 ARM: SoC cleanups for v4.5 2016-01-20 17:55:20 -08:00
mach-axxia
mach-bcm Merge tag 'bcm2835-soc-next-2015-12-28' of http://github.com/anholt/linux into next/soc 2015-12-31 17:37:12 +01:00
mach-berlin
mach-clps711x gpio: generic: factor into gpio_chip struct 2016-01-05 11:21:00 +01:00
mach-cns3xxx
mach-davinci ARM: SoC multiplatform code changes for v4.5 2016-01-20 18:03:56 -08:00
mach-digicolor
mach-dove
mach-ebsa110
mach-efm32
mach-ep93xx
mach-exynos ARM: SoC platform updates for v4.5 2016-01-20 18:10:05 -08:00
mach-footbridge ARM: debug-ll: rework footbridge handling 2015-12-15 23:43:29 +01:00
mach-gemini
mach-highbank
mach-hisi
mach-imx ARM: SoC platform updates for v4.5 2016-01-20 18:10:05 -08:00
mach-integrator Merge branch 'treewide/cleanup' into next/multiplatform 2015-12-18 17:07:52 +01:00
mach-iop13xx
mach-iop32x
mach-iop33x
mach-ixp4xx MTD updates for v4.5: 2016-01-13 11:25:54 -08:00
mach-keystone
mach-ks8695
mach-lpc18xx
mach-lpc32xx dma, mm/pat: Rename dma_*_writecombine() to dma_*_wc() 2016-03-09 14:57:51 +01:00
mach-mediatek ARM: DT updates for v4.5 2016-01-20 18:16:29 -08:00
mach-meson
mach-mmp
mach-moxart
mach-mv78xx0
mach-mvebu ARM: mvebu: Use the ARMADA_370_XP_IRQ option 2016-02-16 17:36:16 +00:00
mach-mxs
mach-netx dma, mm/pat: Rename dma_*_writecombine() to dma_*_wc() 2016-03-09 14:57:51 +01:00
mach-nomadik
mach-nspire dma, mm/pat: Rename dma_*_writecombine() to dma_*_wc() 2016-03-09 14:57:51 +01:00
mach-omap1 ARM: SoC platform updates for v4.5 2016-01-20 18:10:05 -08:00
mach-omap2 ARM: OMAP2+: critical DRA7xx fix for v4.5-rc 2016-03-09 14:15:31 -08:00
mach-orion5x ARM: SoC multiplatform code changes for v4.5 2016-01-20 18:03:56 -08:00
mach-picoxcell
mach-prima2
mach-pxa ARM: SoC multiplatform code changes for v4.5 2016-01-20 18:03:56 -08:00
mach-qcom
mach-realview ARM: realview: use "depends on" instead of "if" after prompt 2016-02-01 12:19:10 -08:00
mach-rockchip Merge branch 'treewide/cleanup' into next/soc 2015-12-22 13:10:00 -08:00
mach-rpc
mach-s3c24xx ARM: s3c: simplify s3c_irqwake_{e,}intallow definition 2015-12-31 17:26:18 +01:00
mach-s3c64xx ARM: SoC multiplatform code changes for v4.5 2016-01-20 18:03:56 -08:00
mach-s5pv210
mach-sa1100 ARM: sa1100/simpad: Be sure to clamp return value 2015-12-22 14:57:50 -08:00
mach-shmobile ARM: shmobile: Remove shmobile_boot_arg 2016-02-17 18:27:21 +09:00
mach-socfpga
mach-spear
mach-sti ARM: SoC cleanups for v4.5 2016-01-20 17:55:20 -08:00
mach-stm32
mach-sunxi
mach-tango ARM: tango: use "depends on" instead of "if" after prompt 2016-02-01 12:18:49 -08:00
mach-tegra ARM: tegra: Core SoC changes for v4.5-rc1 2016-01-12 10:14:52 -08:00
mach-u300
mach-uniphier Merge branch 'treewide/cleanup' into next/soc 2015-12-22 13:10:00 -08:00
mach-ux500 ARM: SoC cleanups for v4.5 2016-01-20 17:55:20 -08:00
mach-versatile ARM: versatile: convert to multi-platform 2015-12-15 23:54:48 +01:00
mach-vexpress
mach-vt8500
mach-w90x900
mach-zx
mach-zynq Merge branch 'treewide/cleanup' into next/soc 2015-12-22 13:10:00 -08:00
mm Merge branch 'fixes' of git://ftp.arm.linux.org.uk/~rmk/linux-arm 2016-03-06 13:51:27 -08:00
net ARM: net: bpf: fix zero right shift 2016-01-06 01:32:09 -05:00
nwfpe
oprofile
plat-iop
plat-omap
plat-orion
plat-pxa
plat-samsung arm/samsung: Change s3c_pm_run_res() to use System RAM type 2016-01-30 09:49:58 +01:00
plat-versatile
probes
tools
vdso ARM/vdso: Mark the vDSO code read-only after init 2016-02-22 08:51:39 +01:00
vfp
xen xen/arm: set the system time in Xen via the XENPF_settime64 hypercall 2015-12-21 14:40:58 +00:00
Kconfig Merge branch 'akpm' (patches from Andrew) 2016-01-21 12:32:08 -08:00
Kconfig-nommu
Kconfig.debug ARM: SoC fixes for v4.5 merge window 2016-01-22 17:26:00 -08:00
Makefile ARM: SoC defconfig updates for v4.5 2016-01-20 18:29:13 -08:00