[V6 00/11] perf: New conditional branch filter

From: Anshuman Khandual
Date: Mon May 05 2014 - 05:13:54 EST

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This patchset is the re-spin of the original branch stack sampling
patchset which introduced new PERF_SAMPLE_BRANCH_COND branch filter. This patchset
also enables SW based branch filtering support for book3s powerpc platforms which
have PMU HW backed branch stack sampling support.

Summary of code changes in this patchset:

(1) Introduces a new PERF_SAMPLE_BRANCH_COND branch filter
(2) Add the "cond" branch filter options in the "perf record" tool
(3) Enable PERF_SAMPLE_BRANCH_COND in X86 platforms
(4) Enable PERF_SAMPLE_BRANCH_COND in POWER8 platform
(5) Update the documentation regarding "perf record" tool
(6) Add some new powerpc instruction analysis functions in code-patching library
(7) Enable SW based branch filter support for powerpc book3s
(8) Changed BHRB configuration in POWER8 to accommodate SW branch filters

With this new SW enablement, the branch filter support for book3s platforms have
been extended to include all these combinations discussed below with a sample test
application program (included here).

Changes in V2
=============
(1) Enabled PPC64 SW branch filtering support
(2) Incorporated changes required for all previous comments

Changes in V3
=============
(1) Split the SW branch filter enablement into multiple patches
(2) Added PMU neutral SW branch filtering code, PMU specific HW branch filtering code
(3) Added new instruction analysis functionality into powerpc code-patching library
(4) Changed name for some of the functions
(5) Fixed couple of spelling mistakes
(6) Changed code documentation in multiple places

Changes in V4
=============
(1) Changed the commit message for patch (01/10)
(2) Changed the patch (02/10) to accommodate review comments from Michael Ellerman
(3) Rebased the patchset against latest Linus's tree

Changes in V5
=============
(1) Added a precursor patch to cleanup the indentation problem in power_pmu_bhrb_read
(2) Added a precursor patch to re-arrange P8 PMU BHRB filter config which improved the clarity
(3) Merged the previous 10th patch into the 8th patch
(4) Moved SW based branch analysis code from core perf into code-patching library as suggested by Michael
(5) Simplified the logic in branch analysis library
(6) Fixed some ambiguities in documentation at various places
(7) Added some more in-code documentation blocks at various places
(8) Renamed some local variable and function names
(9) Fixed some indentation and white space errors in the code
(10) Implemented almost all the review comments and suggestions made by Michael Ellerman on V4 patchset
(11) Enabled privilege mode SW branch filter
(12) Simplified and generalized the SW implemented conditional branch filter
(13) PERF_SAMPLE_BRANCH_COND filter is now supported only through SW implementation
(14) Adjusted other patches to deal with the above changes

Changes in V6
=============
(1) Rebased the patchset against the master
(2) Added "Reviewed-by: Andi Kleen" in the first four patches in the series which changes the
generic or X86 perf code. [https://lkml.org/lkml/2014/4/7/130]

HW implemented branch filters
=============================

(1) perf record -j any_call -e branch-misses:u ./cprog

# Overhead Command Source Shared Object Source Symbol Target Shared Object Target Symbol
# ........ ....... .................... ....................... .................... ....................
#
7.85% cprog cprog [.] sw_3_1 cprog [.] success_3_1_2
5.66% cprog cprog [.] sw_3_1 cprog [.] sw_3_1_2
5.65% cprog cprog [.] hw_1_1 cprog [.] symbol1
5.42% cprog cprog [.] sw_3_1 cprog [.] sw_3_1_3
5.40% cprog cprog [.] callme cprog [.] hw_1_1
5.40% cprog cprog [.] sw_3_1 cprog [.] success_3_1_1
5.40% cprog cprog [.] sw_3_1 cprog [.] sw_3_1_1
5.39% cprog cprog [.] sw_4_2 cprog [.] lr_addr
5.39% cprog cprog [.] callme cprog [.] sw_4_2
5.39% cprog [unknown] [.] 00000000 cprog [.] ctr_addr
5.38% cprog cprog [.] hw_1_2 cprog [.] symbol2
5.38% cprog cprog [.] callme cprog [.] hw_1_2
5.16% cprog cprog [.] sw_3_1 cprog [.] success_3_1_3
5.15% cprog cprog [.] callme cprog [.] sw_3_2
5.14% cprog cprog [.] callme cprog [.] hw_2_2
2.96% cprog cprog [.] callme cprog [.] sw_3_1
2.94% cprog cprog [.] callme cprog [.] hw_2_1
2.71% cprog cprog [.] main cprog [.] callme
2.71% cprog [unknown] [.] 00000000 cprog [.] lr_addr
2.70% cprog cprog [.] sw_4_1 cprog [.] ctr_addr
2.70% cprog cprog [.] callme cprog [.] sw_4_1
0.09% cprog [unknown] [.] 0xf7ad76c4 [unknown] [.] 0xf7ac22c0
0.00% cprog libc-2.11.2.so [.] vfprintf libc-2.11.2.so [.] __errno_location
0.00% cprog libc-2.11.2.so [.] printf libc-2.11.2.so [.] vfprintf
0.00% cprog libc-2.11.2.so [.] _IO_file_doallocate libc-2.11.2.so [.] isatty
0.00% cprog libc-2.11.2.so [.] _IO_file_doallocate libc-2.11.2.so [.] mmap
0.00% cprog libc-2.11.2.so [.] isatty libc-2.11.2.so [.] tcgetattr
0.00% cprog cprog [.] main [unknown] [.] 0x10000950
0.00% cprog [unknown] [.] 00000000 libc-2.11.2.so [.] _IO_file_stat
0.00% cprog [unknown] [.] 0xf7acfca4 cprog [.] _fini
0.00% cprog [unknown] [k] 00000000 cprog [k] ctr_addr
0.00% cprog [unknown] [k] 00000000 cprog [k] lr_addr

SW implemented branch filters
=============================

(2) perf record -j cond -e branch-misses:u ./cprog

# Overhead Command Source Shared Object Source Symbol Target Shared Object Target Symbol
# ........ ....... .................... ...................... .................... ......................
#
25.82% cprog [unknown] [.] 00000000 cprog [.] sw_3_1
12.66% cprog cprog [.] sw_4_2 cprog [.] lr_addr
12.63% cprog [unknown] [.] 00000000 cprog [.] callme
9.42% cprog cprog [.] hw_2_2 cprog [.] address2
9.39% cprog cprog [.] sw_3_1 cprog [.] success_3_1_2
4.91% cprog cprog [.] sw_3_1 cprog [.] success_3_1_1
4.91% cprog cprog [.] sw_3_1 cprog [.] success_3_1_3
3.35% cprog cprog [.] sw_3_1_3 cprog [.] sw_3_1
3.34% cprog cprog [.] sw_3_1_1 cprog [.] sw_3_1
3.31% cprog cprog [.] hw_1_2 cprog [.] symbol2
3.31% cprog cprog [.] sw_4_1 cprog [.] ctr_addr
3.29% cprog cprog [.] hw_2_1 cprog [.] address1
3.27% cprog cprog [.] sw_3_1_2 cprog [.] sw_3_1
0.32% cprog [unknown] [.] 0xf7c62328 [unknown] [.] 0xf7c62320
0.01% cprog libc-2.11.2.so [.] vfprintf libc-2.11.2.so [.] vfprintf
0.01% cprog libc-2.11.2.so [.] _IO_file_xsputn libc-2.11.2.so [.] _IO_file_xsputn
0.01% cprog libc-2.11.2.so [.] _IO_default_xsputn libc-2.11.2.so [.] _IO_default_xsputn
0.01% cprog libc-2.11.2.so [.] strchrnul libc-2.11.2.so [.] strchrnul
0.01% cprog [unknown] [.] 00000000 libc-2.11.2.so [.] _IO_file_xsputn
0.01% cprog [unknown] [k] 00000000 cprog [k] callme

(3) perf record -j any_ret -e branch-misses:u ./cprog

# Overhead Command Source Shared Object Source Symbol Target Shared Object Target Symbol
# ........ ....... .................... ..................... .................... .....................
#
15.61% cprog [unknown] [.] 00000000 cprog [.] sw_3_1
6.28% cprog cprog [.] symbol2 cprog [.] hw_1_2
6.28% cprog cprog [.] ctr_addr cprog [.] sw_4_1
6.26% cprog cprog [.] success_3_1_3 cprog [.] sw_3_1
6.24% cprog cprog [.] symbol1 cprog [.] hw_1_1
6.24% cprog cprog [.] sw_4_2 cprog [.] callme
6.21% cprog [unknown] [.] 00000000 cprog [.] callme
6.19% cprog cprog [.] lr_addr cprog [.] sw_4_2
3.16% cprog cprog [.] hw_1_2 cprog [.] callme
3.15% cprog cprog [.] success_3_1_1 cprog [.] sw_3_1
3.15% cprog cprog [.] sw_4_1 cprog [.] callme
3.14% cprog cprog [.] callme cprog [.] main
3.13% cprog cprog [.] hw_1_1 cprog [.] callme
3.13% cprog cprog [.] sw_3_1_1 cprog [.] sw_3_1
3.12% cprog cprog [.] back2 cprog [.] callme
3.12% cprog cprog [.] sw_3_1 cprog [.] callme
3.11% cprog cprog [.] back1 cprog [.] callme
3.11% cprog cprog [.] sw_3_1_2 cprog [.] sw_3_1
3.11% cprog cprog [.] sw_3_1_3 cprog [.] sw_3_1
3.10% cprog cprog [.] sw_3_2 cprog [.] callme
3.09% cprog cprog [.] success_3_1_2 cprog [.] sw_3_1
0.03% cprog [unknown] [.] 0x100009b0 [unknown] [.] 0xf7d5581c
0.01% cprog libc-2.11.2.so [.] _IO_file_overflow libc-2.11.2.so [.] _IO_file_xsputn
0.01% cprog libc-2.11.2.so [.] _IO_file_setbuf [unknown] [.] 0x0fee1084
0.01% cprog [unknown] [.] 0xf7d5589c libc-2.11.2.so [.] printf
0.01% cprog [unknown] [.] 00000000 libc-2.11.2.so [.] _IO_file_overflow
0.01% cprog [unknown] [.] 00000000 libc-2.11.2.so [.] _IO_file_setbuf
0.01% cprog [unknown] [k] 00000000 cprog [k] callme

(4) perf record -j ind_call -e branch-misses:u ./cprog

# Overhead Command Source Shared Object Source Symbol Target Shared Object Target Symbol
# ........ ....... .................... .............. .................... .....................
#
42.59% cprog [unknown] [.] 00000000 cprog [.] sw_3_1
25.88% cprog cprog [.] sw_4_2 cprog [.] lr_addr
25.65% cprog [unknown] [.] 00000000 cprog [.] callme
5.58% cprog cprog [.] sw_4_1 cprog [.] ctr_addr
0.23% cprog [unknown] [k] 00000000 cprog [k] callme
0.05% cprog [unknown] [.] 00000000 [unknown] [.] 0xf79fd740
0.03% cprog [unknown] [.] 00000000 libc-2.11.2.so [.] _IO_file_overflow

(5) perf record -j any_call,any_ret -e branch-misses:u ./cprog

# Overhead Command Source Shared Object Source Symbol Target Shared Object Target Symbol
# ........ ....... .................... ......................... .................... .....................
#
10.00% cprog [unknown] [.] 00000000 cprog [.] sw_3_1
4.20% cprog cprog [.] sw_4_2 cprog [.] lr_addr
4.17% cprog cprog [.] lr_addr cprog [.] sw_4_2
4.16% cprog cprog [.] symbol1 cprog [.] hw_1_1
4.12% cprog [unknown] [.] 00000000 cprog [.] callme
4.12% cprog cprog [.] symbol2 cprog [.] hw_1_2
4.11% cprog cprog [.] success_3_1_3 cprog [.] sw_3_1
4.11% cprog cprog [.] ctr_addr cprog [.] sw_4_1
4.10% cprog cprog [.] sw_4_2 cprog [.] callme
2.42% cprog cprog [.] callme cprog [.] sw_4_2
2.40% cprog cprog [.] sw_3_1_3 cprog [.] sw_3_1
2.40% cprog cprog [.] sw_3_1 cprog [.] sw_3_1_3
2.39% cprog cprog [.] hw_1_2 cprog [.] symbol2
2.39% cprog cprog [.] back1 cprog [.] callme
2.39% cprog cprog [.] sw_3_1_1 cprog [.] sw_3_1
2.39% cprog cprog [.] sw_3_1 cprog [.] sw_3_1_1
2.39% cprog cprog [.] sw_3_1 cprog [.] callme
2.39% cprog cprog [.] sw_4_1 cprog [.] ctr_addr
2.39% cprog cprog [.] callme cprog [.] hw_1_2
2.39% cprog cprog [.] callme cprog [.] sw_3_1
2.39% cprog cprog [.] sw_3_1_2 cprog [.] sw_3_1
2.39% cprog cprog [.] sw_3_1 cprog [.] sw_3_1_2
2.38% cprog cprog [.] hw_1_1 cprog [.] symbol1
2.38% cprog cprog [.] callme cprog [.] hw_1_1
1.78% cprog cprog [.] back2 cprog [.] callme
1.78% cprog cprog [.] hw_1_1 cprog [.] callme
1.76% cprog cprog [.] success_3_1_2 cprog [.] sw_3_1
1.76% cprog cprog [.] sw_3_1 cprog [.] success_3_1_2
1.76% cprog cprog [.] sw_3_2 cprog [.] callme
1.76% cprog cprog [.] callme cprog [.] sw_3_2
1.73% cprog cprog [.] success_3_1_1 cprog [.] sw_3_1
1.73% cprog cprog [.] sw_3_1 cprog [.] success_3_1_1
1.73% cprog cprog [.] hw_1_2 cprog [.] callme
1.71% cprog cprog [.] sw_3_1 cprog [.] success_3_1_3
1.71% cprog cprog [.] sw_4_1 cprog [.] callme
1.71% cprog cprog [.] callme cprog [.] main
0.05% cprog [unknown] [k] 00000000 cprog [k] callme
0.03% cprog [unknown] [.] 0xf7aa9d4c [unknown] [.] 0xf7aa5f80
0.01% cprog libc-2.11.2.so [.] __errno_location libc-2.11.2.so [.] vfprintf
0.01% cprog libc-2.11.2.so [.] vfprintf libc-2.11.2.so [.] __errno_location
0.01% cprog libc-2.11.2.so [.] _IO_doallocbuf libc-2.11.2.so [.] _IO_file_overflow
0.01% cprog cprog [.] __do_global_dtors_aux [unknown] [.] 0xf7a9fc74
0.01% cprog [unknown] [.] 0xf7a9fca4 cprog [.] _fini

(6) perf record -j any_call,ind_call -e branch-misses:u ./cprog

# Overhead Command Source Shared Object Source Symbol Target Shared Object Target Symbol
# ........ ....... .................... ...................... .................... ......................
#
17.38% cprog [unknown] [.] 00000000 cprog [.] sw_3_1
7.76% cprog cprog [.] sw_4_2 cprog [.] lr_addr
7.64% cprog [unknown] [.] 00000000 cprog [.] callme
6.00% cprog cprog [.] sw_3_1 cprog [.] sw_3_1_1
6.00% cprog cprog [.] callme cprog [.] sw_3_1
5.98% cprog cprog [.] sw_4_1 cprog [.] ctr_addr
5.97% cprog cprog [.] hw_1_1 cprog [.] symbol1
5.97% cprog cprog [.] hw_1_2 cprog [.] symbol2
5.97% cprog cprog [.] sw_3_1 cprog [.] sw_3_1_3
5.97% cprog cprog [.] callme cprog [.] hw_1_1
5.97% cprog cprog [.] callme cprog [.] hw_1_2
5.96% cprog cprog [.] callme cprog [.] sw_4_2
5.95% cprog cprog [.] sw_3_1 cprog [.] sw_3_1_2
1.83% cprog cprog [.] sw_3_1 cprog [.] success_3_1_2
1.82% cprog cprog [.] sw_3_1 cprog [.] success_3_1_1
1.82% cprog cprog [.] sw_3_1 cprog [.] success_3_1_3
1.82% cprog cprog [.] callme cprog [.] sw_3_2
0.14% cprog [unknown] [k] 00000000 cprog [k] callme
0.01% cprog libc-2.11.2.so [.] vfprintf libc-2.11.2.so [.] strchrnul
0.01% cprog libc-2.11.2.so [.] _IO_file_xsputn libc-2.11.2.so [.] _IO_default_xsputn
0.01% cprog libc-2.11.2.so [.] _IO_default_xsputn libc-2.11.2.so [.] _IO_file_overflow
0.01% cprog ld-2.11.2.so [.] calloc [unknown] [.] 0xf795b390
0.01% cprog [unknown] [.] 0x0fee00fc libc-2.11.2.so [.] _IO_file_overflow
0.01% cprog [unknown] [.] 00000000 ld-2.11.2.so [.] calloc
0.01% cprog [unknown] [.] 0xf794b41c [unknown] [.] 0xf794ab70

(7) perf record -j cond,any_ret -e branch-misses:u ./cprog

# Overhead Command Source Shared Object Source Symbol Target Shared Object Target Symbol
# ........ ....... .................... ...................... .................... ......................
#
12.43% cprog [unknown] [.] 00000000 cprog [.] sw_3_1
4.91% cprog cprog [.] lr_addr cprog [.] sw_4_2
4.89% cprog [unknown] [.] 00000000 cprog [.] callme
4.87% cprog cprog [.] sw_4_2 cprog [.] lr_addr
4.87% cprog cprog [.] symbol1 cprog [.] hw_1_1
4.19% cprog cprog [.] hw_2_2 cprog [.] address2
4.19% cprog cprog [.] back2 cprog [.] callme
4.19% cprog cprog [.] sw_3_2 cprog [.] callme
4.18% cprog cprog [.] hw_1_1 cprog [.] callme
4.18% cprog cprog [.] success_3_1_2 cprog [.] sw_3_1
4.18% cprog cprog [.] sw_3_1 cprog [.] success_3_1_2
4.16% cprog cprog [.] sw_4_2 cprog [.] callme
4.13% cprog cprog [.] ctr_addr cprog [.] sw_4_1
4.12% cprog cprog [.] symbol2 cprog [.] hw_1_2
4.12% cprog cprog [.] success_3_1_3 cprog [.] sw_3_1
3.43% cprog cprog [.] callme cprog [.] main
3.42% cprog cprog [.] sw_3_1 cprog [.] success_3_1_3
3.41% cprog cprog [.] success_3_1_1 cprog [.] sw_3_1
3.41% cprog cprog [.] sw_3_1 cprog [.] success_3_1_1
3.41% cprog cprog [.] sw_4_1 cprog [.] callme
3.40% cprog cprog [.] hw_1_2 cprog [.] callme
0.73% cprog cprog [.] sw_3_1_3 cprog [.] sw_3_1
0.73% cprog cprog [.] sw_4_1 cprog [.] ctr_addr
0.72% cprog cprog [.] hw_1_2 cprog [.] symbol2
0.72% cprog cprog [.] sw_3_1_1 cprog [.] sw_3_1
0.70% cprog cprog [.] hw_2_1 cprog [.] address1
0.70% cprog cprog [.] back1 cprog [.] callme
0.70% cprog cprog [.] sw_3_1_2 cprog [.] sw_3_1
0.70% cprog cprog [.] sw_3_1 cprog [.] callme
0.19% cprog [unknown] [.] 0xf7c12328 [unknown] [.] 0xf7c12320
0.01% cprog libc-2.11.2.so [.] __errno_location libc-2.11.2.so [.] vfprintf
0.01% cprog libc-2.11.2.so [.] vfprintf libc-2.11.2.so [.] vfprintf
0.01% cprog libc-2.11.2.so [.] _IO_file_overflow [unknown] [.] 0x0fee0100
0.01% cprog libc-2.11.2.so [.] _IO_default_xsputn libc-2.11.2.so [.] _IO_default_xsputn
0.01% cprog [unknown] [.] 00000000 libc-2.11.2.so [.] _IO_file_overflow

(8) perf record -j cond,ind_call -e branch-misses:u ./cprog

# Overhead Command Source Shared Object Source Symbol Target Shared Object Target Symbol
# ........ ....... .................... .............. .................... .................
#
20.70% cprog [unknown] [.] 00000000 cprog [.] sw_3_1
9.99% cprog cprog [.] sw_4_2 cprog [.] lr_addr
9.91% cprog [unknown] [.] 00000000 cprog [.] callme
9.45% cprog cprog [.] sw_3_1_3 cprog [.] sw_3_1
9.44% cprog cprog [.] hw_2_1 cprog [.] address1
9.43% cprog cprog [.] sw_3_1_1 cprog [.] sw_3_1
9.42% cprog cprog [.] hw_1_2 cprog [.] symbol2
9.42% cprog cprog [.] sw_3_1_2 cprog [.] sw_3_1
9.42% cprog cprog [.] sw_4_1 cprog [.] ctr_addr
0.65% cprog cprog [.] sw_3_1 cprog [.] success_3_1_1
0.62% cprog cprog [.] sw_3_1 cprog [.] success_3_1_3
0.56% cprog cprog [.] hw_2_2 cprog [.] address2
0.55% cprog cprog [.] sw_3_1 cprog [.] success_3_1_2
0.29% cprog [unknown] [.] 0xf7f72328 [unknown] [.] 0xf7f72320
0.10% cprog [unknown] [k] 00000000 cprog [k] callme
0.02% cprog libc-2.11.2.so [.] _IO_setb libc-2.11.2.so [.] _IO_setb

(9) perf record -e branch-misses:u -j any_call,any_ret,ind_call,cond ./cprog

# Overhead Command Source Shared Object Source Symbol Target Shared Object Target Symbol
# ........ ....... .................... .................. .................... .......................
#
9.31% cprog [unknown] [.] 00000000 cprog [.] sw_3_1
4.04% cprog cprog [.] symbol1 cprog [.] hw_1_1
4.03% cprog cprog [.] lr_addr cprog [.] sw_4_2
4.03% cprog cprog [.] sw_4_2 cprog [.] lr_addr
4.00% cprog [unknown] [.] 00000000 cprog [.] callme
3.88% cprog cprog [.] ctr_addr cprog [.] sw_4_1
3.87% cprog cprog [.] sw_4_2 cprog [.] callme
3.86% cprog cprog [.] symbol2 cprog [.] hw_1_2
3.86% cprog cprog [.] success_3_1_3 cprog [.] sw_3_1
2.49% cprog cprog [.] sw_4_1 cprog [.] ctr_addr
2.47% cprog cprog [.] hw_1_1 cprog [.] symbol1
2.47% cprog cprog [.] sw_3_1_1 cprog [.] sw_3_1
2.47% cprog cprog [.] sw_3_1 cprog [.] sw_3_1_1
2.47% cprog cprog [.] callme cprog [.] hw_1_1
2.47% cprog cprog [.] callme cprog [.] sw_3_1
2.47% cprog cprog [.] hw_1_2 cprog [.] symbol2
2.47% cprog cprog [.] hw_2_1 cprog [.] address1
2.47% cprog cprog [.] back1 cprog [.] callme
2.47% cprog cprog [.] sw_3_1_3 cprog [.] sw_3_1
2.47% cprog cprog [.] sw_3_1 cprog [.] sw_3_1_3
2.47% cprog cprog [.] sw_3_1 cprog [.] callme
2.47% cprog cprog [.] callme cprog [.] hw_1_2
2.47% cprog cprog [.] callme cprog [.] sw_4_2
2.46% cprog cprog [.] sw_3_1_2 cprog [.] sw_3_1
2.46% cprog cprog [.] sw_3_1 cprog [.] sw_3_1_2
1.57% cprog cprog [.] success_3_1_2 cprog [.] sw_3_1
1.57% cprog cprog [.] sw_3_1 cprog [.] success_3_1_2
1.57% cprog cprog [.] hw_1_1 cprog [.] callme
1.56% cprog cprog [.] hw_2_2 cprog [.] address2
1.56% cprog cprog [.] back2 cprog [.] callme
1.56% cprog cprog [.] sw_3_2 cprog [.] callme
1.56% cprog cprog [.] callme cprog [.] sw_3_2
1.41% cprog cprog [.] success_3_1_1 cprog [.] sw_3_1
1.41% cprog cprog [.] sw_3_1 cprog [.] success_3_1_1
1.40% cprog cprog [.] sw_4_1 cprog [.] callme
1.39% cprog cprog [.] hw_1_2 cprog [.] callme
1.39% cprog cprog [.] sw_3_1 cprog [.] success_3_1_3
1.39% cprog cprog [.] callme cprog [.] main
0.14% cprog [unknown] [.] 0xf7d72328 [unknown] [.] 0xf7d72320
0.03% cprog [unknown] [k] 00000000 cprog [k] callme
0.01% cprog libc-2.11.2.so [.] _IO_doallocbuf libc-2.11.2.so [.] _IO_doallocbuf
0.01% cprog libc-2.11.2.so [.] printf cprog [.] main
0.01% cprog libc-2.11.2.so [.] _IO_doallocbuf libc-2.11.2.so [.] _IO_file_doallocate
0.01% cprog ld-2.11.2.so [.] malloc [unknown] [.] 0xf7d8b380
0.01% cprog cprog [.] main [unknown] [.] 0x0fe7f63c
0.01% cprog [unknown] [.] 0xf7d8b388 ld-2.11.2.so [.] __libc_memalign
0.01% cprog [unknown] [.] 00000000 ld-2.11.2.so [.] malloc

Please refer to the V4 version of the patchset to learn about the sample test case and it's makefile.

Anshuman Khandual (11):
perf: Add PERF_SAMPLE_BRANCH_COND
perf, tool: Conditional branch filter 'cond' added to perf record
x86, perf: Add conditional branch filtering support
perf, documentation: Description for conditional branch filter
powerpc, perf: Re-arrange BHRB processing
powerpc, perf: Re-arrange PMU based branch filter processing in POWER8
powerpc, perf: Change the name of HW PMU branch filter tracking variable
powerpc, lib: Add new branch analysis support functions
powerpc, perf: Enable SW filtering in branch stack sampling framework
power8, perf: Adapt BHRB PMU configuration to work with SW filters
powerpc, perf: Enable privilege mode SW branch filters

arch/powerpc/include/asm/code-patching.h | 16 ++
arch/powerpc/include/asm/perf_event_server.h | 6 +-
arch/powerpc/lib/code-patching.c | 80 +++++++
arch/powerpc/perf/core-book3s.c | 323 ++++++++++++++++++++++-----
arch/powerpc/perf/power8-pmu.c | 70 ++++--
arch/x86/kernel/cpu/perf_event_intel_lbr.c | 5 +
include/uapi/linux/perf_event.h | 3 +-
tools/perf/Documentation/perf-record.txt | 3 +-
tools/perf/builtin-record.c | 1 +
9 files changed, 429 insertions(+), 78 deletions(-)

--
1.7.11.7

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