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5c093efa6f
linux/arch/powerpc
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Anton Blanchard 5c093efa6f powerpc/perf: Always use pt_regs for userspace samples 
At the moment we always use the SIAR if the PMU supports continuous
sampling. Unfortunately the SIAR and the PMU exception are not
synchronised for non marked events so we can end up with callchains
that dont make sense.

The following patch checks the HV and PR bits for samples coming from
userspace and always uses pt_regs for them. Userspace will never have
interrupts off so there is no real advantage to using the SIAR for
non marked events in userspace.

I had experimented with a patch that did a similar thing for kernel
samples but we lost a significant amount of information. I was
unable to profile any of our early exception code for example.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2012-07-10 19:18:43 +10:00
..
boot powerpc: Kill flatdevtree_env.h too 2012-07-03 14:14:50 +10:00
configs powerpc: Enable jump label support 2012-07-03 14:14:40 +10:00
include/asm powerpc/perf: Move code to select SIAR or pt_regs into perf_read_regs 2012-07-10 19:18:41 +10:00
kernel powerpc: Enforce usage of RA 0-R31 where possible 2012-07-10 19:18:35 +10:00
kvm powerpc: Enforce usage of R0-R31 where possible 2012-07-10 19:18:30 +10:00
lib powerpc: Fixes for instructions not using correct register naming 2012-07-10 19:18:16 +10:00
math-emu powerpc/math_emu/efp: Look for errata handler when type mismatches 2011-10-06 23:36:47 -05:00
mm powerpc: Enforce usage of RA 0-R31 where possible 2012-07-10 19:18:35 +10:00
net powerpc: Start using ___PPC_RA/B/S/T where necessary 2012-07-10 19:18:25 +10:00
oprofile Disintegrate asm/system.h for PowerPC 2012-03-28 18:30:02 +01:00
perf powerpc/perf: Always use pt_regs for userspace samples 2012-07-10 19:18:43 +10:00
platforms powerpc: Change LOAD_REG_ADDR to use real register names 2012-07-10 19:18:14 +10:00
sysdev Merge remote-tracking branch 'jwb/next' into next 2012-05-10 12:58:24 +10:00
xmon powerpc/xmon: Use cpumask iterator to avoid warning 2012-07-02 14:30:11 +10:00
Kconfig powerpc: Use the new generic strncpy_from_user() and strnlen_user() 2012-05-27 21:00:07 -07:00
Kconfig.debug irqdomain: Remove powerpc dependency from debugfs file 2012-03-29 14:31:02 -06:00
Makefile powerpc/crypto: Build files for the nx device driver 2012-05-16 15:05:45 +10:00
relocs_check.pl powerpc: Process dynamic relocations for kernel 2011-12-20 10:21:08 -05:00