Re: [PATCH V2 0/6] perf: New conditional branch filter

From: Stephane Eranian
Date: Fri Aug 30 2013 - 07:48:16 EST

2013/8/30 Anshuman Khandual <khandual@xxxxxxxxxxxxxxxxxx>
>
> This patchset is the re-spin of the original branch stack sampling
> patchset which introduced new PERF_SAMPLE_BRANCH_COND filter. This patchset
> also enables SW based branch filtering support for PPC64 platforms which have
> branch stack sampling support. With this new enablement, the branch filter support
> for PPC64 platforms have been extended to include all these combinations discussed
> below with a sample test application program.
>
>
I am trying to understand which HW has support for capturing the
branches: PPC7 or PPC8.
Then it seems you're saying that only PPC8 has the filtering support.
On PPC7 you use the
SW filter. Did I get this right?

I will look at the patch set.

>
> (1) perf record -e branch-misses:u -b ./cprog
> # Overhead Command Source Shared Object Source Symbol Target Shared Object Target Symbol
> # ........ ....... .................... ..................... .................... .....................
> #
> 4.42% cprog cprog [k] sw_4_2 cprog [k] lr_addr
> 4.41% cprog cprog [k] symbol2 cprog [k] hw_1_2
> 4.41% cprog cprog [k] ctr_addr cprog [k] sw_4_1
> 4.41% cprog cprog [k] lr_addr cprog [k] sw_4_2
> 4.41% cprog cprog [k] sw_4_2 cprog [k] callme
> 4.41% cprog cprog [k] symbol1 cprog [k] hw_1_1
> 4.41% cprog cprog [k] success_3_1_3 cprog [k] sw_3_1
> 2.43% cprog cprog [k] sw_4_1 cprog [k] ctr_addr
> 2.43% cprog cprog [k] hw_1_2 cprog [k] symbol2
> 2.43% cprog cprog [k] callme cprog [k] hw_1_2
> 2.43% cprog cprog [k] address1 cprog [k] back1
> 2.43% cprog cprog [k] back1 cprog [k] callme
> 2.43% cprog cprog [k] hw_2_1 cprog [k] address1
> 2.43% cprog cprog [k] sw_3_1_1 cprog [k] sw_3_1
> 2.43% cprog cprog [k] sw_3_1_2 cprog [k] sw_3_1
> 2.43% cprog cprog [k] sw_3_1_3 cprog [k] sw_3_1
> 2.43% cprog cprog [k] sw_3_1 cprog [k] sw_3_1_1
> 2.43% cprog cprog [k] sw_3_1 cprog [k] sw_3_1_2
> 2.43% cprog cprog [k] sw_3_1 cprog [k] sw_3_1_3
> 2.43% cprog cprog [k] callme cprog [k] sw_3_1
> 2.43% cprog cprog [k] callme cprog [k] sw_4_2
> 2.43% cprog cprog [k] hw_1_1 cprog [k] symbol1
> 2.43% cprog cprog [k] callme cprog [k] hw_1_1
> 2.42% cprog cprog [k] sw_3_1 cprog [k] callme
> 1.99% cprog cprog [k] success_3_1_1 cprog [k] sw_3_1
> 1.99% cprog cprog [k] sw_3_1 cprog [k] success_3_1_1
> 1.99% cprog cprog [k] address2 cprog [k] back2
> 1.99% cprog cprog [k] hw_2_2 cprog [k] address2
> 1.99% cprog cprog [k] back2 cprog [k] callme
> 1.99% cprog cprog [k] callme cprog [k] main
> 1.99% cprog cprog [k] sw_3_1 cprog [k] success_3_1_3
> 1.99% cprog cprog [k] hw_1_1 cprog [k] callme
> 1.99% cprog cprog [k] sw_3_2 cprog [k] callme
> 1.99% cprog cprog [k] callme cprog [k] sw_3_2
> 1.99% cprog cprog [k] success_3_1_2 cprog [k] sw_3_1
> 1.99% cprog cprog [k] sw_3_1 cprog [k] success_3_1_2
> 1.99% cprog cprog [k] hw_1_2 cprog [k] callme
> 1.99% cprog cprog [k] sw_4_1 cprog [k] callme
> 0.02% cprog [unknown] [k] 0xf7ba2328 [unknown] [k] 0xf7ba2320
> 0.00% cprog libc-2.11.2.so [k] _IO_file_overflow libc-2.11.2.so [k] _IO_file_overflow
> 0.00% cprog libc-2.11.2.so [k] _IO_file_xsputn libc-2.11.2.so [k] _IO_file_overflow
> 0.00% cprog cprog [k] callme cprog [k] hw_2_2
>
> PMU filters
> -----------
> (2) perf record -e branch-misses:u -j any_call ./cprog
>
> # Overhead Command Source Shared Object Source Symbol Target Shared Object Target Symbol
> # ........ ....... .................... ....................... .................... ......................
> #
> 7.82% cprog cprog [k] sw_3_1 cprog [k] success_3_1_2
> 6.88% cprog cprog [k] sw_3_1 cprog [k] sw_3_1_2
> 6.88% cprog cprog [k] hw_1_1 cprog [k] symbol1
> 5.88% cprog cprog [k] sw_3_1 cprog [k] sw_3_1_1
> 5.88% cprog cprog [k] callme cprog [k] hw_1_1
> 5.88% cprog cprog [k] sw_3_1 cprog [k] success_3_1_1
> 5.88% cprog cprog [k] sw_3_1 cprog [k] sw_3_1_3
> 5.88% cprog cprog [k] callme cprog [k] hw_1_2
> 5.88% cprog cprog [k] hw_1_2 cprog [k] symbol2
> 5.88% cprog cprog [k] sw_4_2 cprog [k] lr_addr
> 5.88% cprog cprog [k] callme cprog [k] sw_4_2
> 4.88% cprog cprog [k] sw_3_1 cprog [k] success_3_1_3
> 4.88% cprog cprog [k] callme cprog [k] sw_3_2
> 4.88% cprog cprog [k] callme cprog [k] hw_2_2
> 3.94% cprog cprog [k] callme cprog [k] sw_3_1
> 3.94% cprog cprog [k] callme cprog [k] hw_2_1
> 2.94% cprog cprog [k] main cprog [k] callme
> 2.94% cprog cprog [k] sw_4_1 cprog [k] ctr_addr
> 2.94% cprog cprog [k] callme cprog [k] sw_4_1
> 0.01% cprog [unknown] [k] 0xf79076c4 [unknown] [k] 0xf78f22c0
> 0.00% cprog libc-2.11.2.so [k] _IO_file_doallocate libc-2.11.2.so [k] _IO_setb
> 0.00% cprog libc-2.11.2.so [k] _IO_file_doallocate libc-2.11.2.so [k] mmap
> 0.00% cprog libc-2.11.2.so [k] _IO_file_xsputn libc-2.11.2.so [k] _IO_default_xsputn
> 0.00% cprog libc-2.11.2.so [k] _IO_file_overflow libc-2.11.2.so [k] _IO_do_write
> 0.00% cprog ld-2.11.2.so [k] malloc [unknown] [k] 0xf790b380
>
>
> (3) perf record -e branch-misses:u -j cond ./cprog
> # Overhead Command Source Shared Object Source Symbol Target Shared Object Target Symbol
> # ........ ....... .................... .................. .................... .......................
> #
> 24.85% cprog [unknown] [k] 00000000 cprog [k] callme
> 15.71% cprog cprog [k] sw_3_1 cprog [k] sw_3_1
> 7.14% cprog cprog [k] sw_4_2 cprog [k] lr_addr
> 6.57% cprog [unknown] [k] 00000000 cprog [k] sw_4_2
> 4.57% cprog cprog [k] hw_2_2 cprog [k] callme
> 4.57% cprog cprog [k] sw_3_1_1 cprog [k] sw_3_1
> 4.57% cprog cprog [k] sw_4_1 cprog [k] ctr_addr
> 4.57% cprog [unknown] [k] 00000000 cprog [k] sw_4_1
> 4.57% cprog cprog [k] main cprog [k] hw_1_1
> 4.57% cprog cprog [k] hw_1_2 cprog [k] hw_1_2
> 4.57% cprog [unknown] [k] 00000000 cprog [k] main
> 4.57% cprog cprog [k] hw_2_1 cprog [k] callme
> 4.57% cprog cprog [k] sw_3_1_3 cprog [k] sw_3_1
> 4.57% cprog cprog [k] sw_3_1_2 cprog [k] sw_3_1
> 0.01% cprog [unknown] [k] 0xf7aa25dc [unknown] [k] 0xf7aa27e4
> 0.00% cprog libc-2.11.2.so [k] _IO_doallocbuf libc-2.11.2.so [k] _IO_file_doallocate
> 0.00% cprog [unknown] [k] 00000000 libc-2.11.2.so [k] _IO_file_doallocate
> 0.00% cprog [unknown] [k] 00000000 libc-2.11.2.so [k] _IO_file_stat
>
> SW filters
> ----------
> (4) perf record -e branch-misses:u -j any_ret ./cprog
> # Overhead Command Source Shared Object Source Symbol Target Shared Object Target Symbol
> # ........ ....... .................... ................. .................... ..............
> #
> 7.91% cprog cprog [k] symbol1 cprog [k] hw_1_1
> 7.91% cprog cprog [k] success_3_1_3 cprog [k] sw_3_1
> 7.91% cprog cprog [k] ctr_addr cprog [k] sw_4_1
> 7.91% cprog cprog [k] lr_addr cprog [k] sw_4_2
> 7.91% cprog cprog [k] symbol2 cprog [k] hw_1_2
> 7.90% cprog cprog [k] sw_4_2 cprog [k] callme
> 4.34% cprog cprog [k] success_3_1_2 cprog [k] sw_3_1
> 4.33% cprog cprog [k] sw_4_1 cprog [k] callme
> 4.33% cprog cprog [k] hw_1_2 cprog [k] callme
> 4.33% cprog cprog [k] success_3_1_1 cprog [k] sw_3_1
> 4.33% cprog cprog [k] sw_3_2 cprog [k] callme
> 4.33% cprog cprog [k] back2 cprog [k] callme
> 4.33% cprog cprog [k] callme cprog [k] main
> 4.33% cprog cprog [k] hw_1_1 cprog [k] callme
> 3.58% cprog cprog [k] sw_3_1 cprog [k] callme
> 3.58% cprog cprog [k] sw_3_1_1 cprog [k] sw_3_1
> 3.58% cprog cprog [k] sw_3_1_2 cprog [k] sw_3_1
> 3.58% cprog cprog [k] back1 cprog [k] callme
> 3.57% cprog cprog [k] sw_3_1_3 cprog [k] sw_3_1
> 0.00% cprog [unknown] [k] 0xf7abacf4 [unknown] [k] 0xf7abae40
>
>
> (5) perf record -e branch-misses:u -j ind_call ./cprog
> # Overhead Command Source Shared Object Source Symbol Target Shared Object Target Symbol
> # ........ ....... .................... ............. .................... .............
> #
> 63.56% cprog cprog [k] sw_4_2 cprog [k] lr_addr
> 36.44% cprog cprog [k] sw_4_1 cprog [k] ctr_addr
>
>
> Mixed filters
> -------------
> (6) perf record -e branch-misses:u -j any_call,any_ret ./cprog
> Error:
> The perf.data file has no samples!
>
> NOTE: As expected. The HW filters all the branches which are calls and SW tries to find return
> branches in that given set. Both the filters are mutually exclussive, so obviously no samples
> found in the end profile.
>
> (7) perf record -e branch-misses:u -j any_call,ind_call ./cprog
> # Overhead Command Source Shared Object Source Symbol Target Shared Object Target Symbol
> # ........ ....... .................... .............. .................... ..............
> #
> 66.69% cprog cprog [k] sw_4_2 cprog [k] lr_addr
> 33.31% cprog cprog [k] sw_4_1 cprog [k] ctr_addr
> 0.00% cprog [unknown] [k] 0x0fe7f264 [unknown] [k] 0x0ff926d0
>
>
> (8) perf record -e branch-misses:u -j any_call,any_ret,ind_call ./cprog
> Error:
> The perf.data file has no samples!
>
> (9) perf record -e branch-misses:u -j cond,any_ret ./cprog
> # Overhead Command Source Shared Object Source Symbol Target Shared Object Target Symbol
> # ........ ....... .................... .............. .................... .......................
> #
> 46.01% cprog [unknown] [k] 00000000 cprog [k] callme
> 13.54% cprog [unknown] [k] 00000000 cprog [k] sw_4_2
> 8.18% cprog cprog [k] sw_3_1_2 cprog [k] sw_3_1
> 8.07% cprog [unknown] [k] 00000000 cprog [k] main
> 8.07% cprog cprog [k] sw_3_1_1 cprog [k] sw_3_1
> 8.07% cprog cprog [k] sw_3_1_3 cprog [k] sw_3_1
> 8.07% cprog [unknown] [k] 00000000 cprog [k] sw_4_1
> 0.00% cprog [unknown] [k] 00000000 [unknown] [k] 0xf7c1480c
> 0.00% cprog libc-2.11.2.so [k] mmap libc-2.11.2.so [k] _IO_file_doallocate
>
> (10) perf record -e branch-misses:u -j cond,ind_call ./cprog
> # Overhead Command Source Shared Object Source Symbol Target Shared Object Target Symbol
> # ........ ....... .................... .............. .................... ..............
> #
> 48.11% cprog [unknown] [k] 00000000 cprog [k] callme
> 13.52% cprog [unknown] [k] 00000000 cprog [k] sw_4_2
> 12.42% cprog cprog [k] sw_4_2 cprog [k] lr_addr
> 8.65% cprog [unknown] [k] 00000000 cprog [k] main
> 8.65% cprog cprog [k] sw_4_1 cprog [k] ctr_addr
> 8.65% cprog [unknown] [k] 00000000 cprog [k] sw_4_1
> 0.00% cprog [unknown] [k] 00000000 [unknown] [k] 0xf7a4581c
>
>
> (11) perf record -e branch-misses:u -j cond,any_ret,ind_call ./cprog
> # Overhead Command Source Shared Object Source Symbol Target Shared Object Target Symbol
> # ........ ....... .................... .............. .................... .................
> #
> 45.91% cprog [unknown] [k] 00000000 cprog [k] callme
> 13.26% cprog [unknown] [k] 00000000 cprog [k] sw_4_2
> 8.17% cprog cprog [k] sw_3_1_3 cprog [k] sw_3_1
> 8.17% cprog [unknown] [k] 00000000 cprog [k] sw_4_1
> 8.17% cprog cprog [k] sw_3_1_2 cprog [k] sw_3_1
> 8.17% cprog [unknown] [k] 00000000 cprog [k] main
> 8.16% cprog cprog [k] sw_3_1_1 cprog [k] sw_3_1
> 0.00% cprog [unknown] [k] 00000000 [unknown] [k] 0xf7f87704
> 0.00% cprog [unknown] [k] 00000000 libc-2.11.2.so [k] _IO_file_sync
>
> Test application program
> ========================
> (1) Makefile:
> --------------------------------------------
> all: sample.o cprog of.cprog of.sample
>
> sample.o: sample.s
> as -o sample.o sample.s
> cprog: cprog.c sample.o
> gcc -o cprog cprog.c sample.o
> of.sample: sample.o
> objdump -d sample.o > of.sample
> of.cprog: cprog
> objdump -d cprog > of.cprog
> clean:
> rm sample.o cprog of.sample of.cprog
> ---------------------------------------------
> (2) cprog.c
> ---------------------------------------------
> #include <stdio.h>
> #define LOOP_COUNT 100000
>
> extern void callme(void);
>
> int main(int argc, char *argv[])
> {
> int i;
> for(i = 0; i < LOOP_COUNT; i++)
> callme();
>
> printf("end");
> return 0;
> }
> ---------------------------------------------
> (3) sample.S
> ---------------------------------------------
> # r25, r26, r27 will be used as first level, second level
> # and third level stack for LR. Register r20, r21, r22, r23
> # r24 will be used for general programming purpose.
>
> .data
>
> msg:
> .string "BHRB filter tests\n"
> len = . - msg
> msg_1_1:
> .string "Test: hw_1_1\n"
> len_1_1 = 13
> msg_1_2:
> .string "Test: hw_1_2\n"
> len_1_2 = 13
> msg_2_1:
> .string "Test: hw_2_1\n"
> len_2_1 = 13
> msg_2_2:
> .string "Test: hw_2_2\n"
> len_2_2 = 13
> msg_3_1:
> .string "Test: sw_3_1\n"
> len_3_1 = 13
> msg_3_1_1:
> .string "Test: sw_3_1_1\n"
> len_3_1_1 = 15
> msg_3_1_2:
> .string "Test: sw_3_1_2\n"
> len_3_1_2 = 15
> msg_3_1_3:
> .string "Test: sw_3_1_3\n"
> len_3_1_3 = 15
> msg_3_2:
> .string "Test: sw_3_2\n"
> len_3_3 = 13
> msg_4_1:
> .string "Test: sw_4_1\n"
> len_4_1 = 13
> msg_4_2:
> .string "Test: sw_4_2\n"
> len_4_2 = 13
>
> hw_3_1_1_passed:
> .string "\thw_3_1_1_passed\n\n"
> len_hw_3_1_1_passed = 18
> hw_3_1_2_passed:
> .string "\thw_3_1_2_passed\n\n"
> len_hw_3_1_2_passed = 18
> hw_3_1_3_passed:
> .string "\thw_3_1_3_passed\n\n"
> len_hw_3_1_3_passed = 18
>
> hw_2_1_passed:
> .string "\thw_2_1_passed\n\n"
> len_hw_2_1_passed = 16
>
> hw_2_2_passed:
> .string "\thw_2_2_passed\n\n"
> len_hw_2_2_passed = 16
>
> hw_1_1_passed:
> .string "\thw_1_1_passed\n\n"
> len_hw_1_1_passed = 16
>
> hw_1_2_passed:
> .string "\thw_1_2_passed\n\n"
> len_hw_1_2_passed = 16
>
> hw_4_1_passed:
> .string "\thw_4_1_passed\n\n"
> len_hw_4_1_passed = 16
>
> hw_4_2_passed:
> .string "\thw_4_2_passed\n\n"
> len_hw_4_2_passed = 16
>
> msg_error:
> .string "\tError\n"
> len_error = 7
> .text
> .global callme
> .global hw_1_1
> .global hw_1_2
> .global hw_2_1
> .global hw_2_2
>
> # HW filter test symbols
> symbol1:
> # Print "hw_1_1_passed"
> li 0, 4
> li 3, 1
> lis 4, hw_1_1_passed@ha
> addi 4, 4, hw_1_1_passed@l
> li 5, len_hw_1_1_passed
> sc
>
> blr # PERF_SAMPLE_BRANCH_ANY_RET
>
> hw_1_1:
> # Save LR - second level
> mflr 26
>
> # Print "hw_1_1 called"
> li 0, 4
> li 3, 1
> lis 4, msg_1_1@ha
> addi 4, 4, msg_1_1@l
> li 5, len_1_1
> sc
>
> bl symbol1 # PERF_SAMPLE_BRANCH_ANY_CALL
>
> # Restore LR
> mtlr 26
> blr # PERF_SAMPLE_BRANCH_ANY_RET
>
> symbol2:
> # Print "Symbol2 taken"
> li 0, 4
> li 3, 1
> lis 4, hw_1_2_passed@ha
> addi 4, 4, hw_1_2_passed@l
> li 5, len_hw_1_2_passed
> sc
>
> blr # PERF_SAMPLE_BRANCH_ANY_RET
> hw_1_2:
> # Save LR - second level
> mflr 26
>
> # Print "hw_1_2 called"
> li 0, 4
> li 3, 1
> lis 4, msg_1_2@ha
> addi 4, 4, msg_1_2@l
> li 5, len_1_2
> sc
>
> li 4,20
> cmpi 0,4,20
> bcl 12, 4*cr0+2, symbol2 # PERF_SAMPLE_BRANCH_ANY_CALL | PERF_SAMPLE_BRANCH_COND
>
> mtlr 26
> blr # PERF_SAMPLE_BRANCH_ANY_RET
>
> # HW filter test
>
> address1:
> # Print "hw_2_1_passed"
> li 0, 4
> li 3, 1
> lis 4, hw_2_1_passed@ha
> addi 4, 4, hw_2_1_passed@l
> li 5, len_hw_2_1_passed
> sc
> b back1 # PERF_SAMPLE_BRANCH_ANY
>
> hw_2_1:
> # Print "hw_2_1 called"
> li 0, 4
> li 3, 1
> lis 4, msg_2_1@ha
> addi 4, 4, msg_2_1@l
> li 5, len_2_1
> sc
>
> # Simple conditional branch (equal)
> li 20, 12
> cmpi 3, 20, 12
> bc 12, 4*cr3+2, address1 # PERF_SAMPLE_BRANCH_COND
>
> back1:
> blr # PERF_SAMPLE_BRANCH_ANY_RET
>
> address2:
> # Print "hw_2_2_passed"
> li 0, 4
> li 3, 1
> lis 4, hw_2_2_passed@ha
> addi 4, 4, hw_2_2_passed@l
> li 5, len_hw_2_2_passed
> sc
> b back2 # PERF_SAMPLE_BRANCH_ANY
>
> hw_2_2:
> # Print "hw_2_2 called"
> li 0, 4
> li 3, 1
> lis 4, msg_2_2@ha
> addi 4, 4, msg_2_2@l
> li 5, len_2_2
> sc
>
> # Simple conditional branch (less than)
> li 20, 12
> cmpi 4, 20, 20
> bc 12, 4*cr4+0, address2 # PERF_SAMPLE_BRANCH_COND
> back2:
> blr # PERF_SAMPLE_BRANCH_ANY_RET
>
> # SW filter test symbols
> sw_3_1_1:
> # Print "Test: sw_3_1_1"
> li 0, 4
> li 3, 1
> lis 4, msg_3_1_1@ha
> addi 4, 4, msg_3_1_1@l
> li 5, len_3_1_1
> sc
>
> li 22,0
> # Test the condition and return
> li 21, 10
> cmpi 0, 21, 10
> bclr 12, 2 # PERF_SAMPLE_BRANCH_ANY_RET | PERF_SAMPLE_BRANCH_COND
>
> # Should not have come here
> li 0, 4
> li 3, 1
> lis 4, msg_error@ha
> addi 4, 4, msg_error@l
> li 5, len_error
> sc
>
> # Mark the error
> li 22, 1
>
> # Safe fall back
> blr # PERF_SAMPLE_BRANCH_ANY_RET
>
> sw_3_1_2:
> # Print "Test: sw_3_1_2"
> li 0, 4
> li 3, 1
> lis 4, msg_3_1_2@ha
> addi 4, 4, msg_3_1_2@l
> li 5, len_3_1_2
> sc
>
> li 23, 0
> # Test the condition and return
> li 21, 10
> cmpi 0, 21, 20
> bclr 12, 0 # PERF_SAMPLE_BRANCH_ANY_RET | PERF_SAMPLE_BRANCH_COND
>
> # Should not have come here
> li 0, 4
> li 3, 1
> lis 4, msg_error@ha
> addi 4, 4, msg_error@l
> li 5, len_error
> sc
>
> # Mark the error
> li 23, 1
>
> # Safe fall back
> blr # PERF_SAMPLE_BRANCH_ANY_RET
>
> sw_3_1_3:
> # Print "Test: sw_3_1_3"
> li 0, 4
> li 3, 1
> lis 4, msg_3_1_3@ha
> addi 4, 4, msg_3_1_3@l
> li 5, len_3_1_3
> sc
>
> li 24, 0
> # Test the condition and return
> li 21, 10
> cmpi 0, 21, 5
> bclr 12, 1 # PERF_SAMPLE_BRANCH_ANY_RET | PERF_SAMPLE_BRANCH_COND
>
> # Mark the error
> li 24, 1
>
> # Should not have come here
> li 0, 4
> li 3, 1
> lis 4, msg_error@ha
> addi 4, 4, msg_error@l
> li 5, len_error
> sc
>
> # Safe fall back
> blr # PERF_SAMPLE_BRANCH_ANY_RET
>
> success_3_1_1:
> li 0, 4
> li 3, 1
> lis 4, hw_3_1_1_passed@ha
> addi 4, 4, hw_3_1_1_passed@l
> li 5, len_hw_3_1_1_passed
> sc
> blr
>
> success_3_1_2:
> li 0, 4
> li 3, 1
> lis 4, hw_3_1_2_passed@ha
> addi 4, 4, hw_3_1_2_passed@l
> li 5, len_hw_3_1_2_passed
> sc
> blr
>
> success_3_1_3:
> li 0, 4
> li 3, 1
> lis 4, hw_3_1_3_passed@ha
> addi 4, 4, hw_3_1_3_passed@l
> li 5, len_hw_3_1_3_passed
> sc
> blr
>
> sw_3_1:
> # Save LR
> mflr 26
>
> # Print "Test: sw_3_1"
> li 0, 4
> li 3, 1
> lis 4, msg_3_1@ha
> addi 4, 4, msg_3_1@l
> li 5, len_3_1
> sc
>
> # Equal comparison condition
> bl sw_3_1_1 # PERF_SAMPLE_BRANCH_ANY_CALL
> cmpi 0, 22, 0
> bcl 12, 2, success_3_1_1 # PERF_SAMPLE_BRANCH_ANY_CALL | PERF_SAMPLE_BRANCH_COND
>
> # LT comparison condition
> bl sw_3_1_2 # PERF_SAMPLE_BRANCH_ANY_CALL
> cmpi 0, 23, 0
> bcl 12, 2, success_3_1_2 # PERF_SAMPLE_BRANCH_ANY_CALL | PERF_SAMPLE_BRANCH_COND
>
> # GT comparison condition
> bl sw_3_1_3 # PERF_SAMPLE_BRANCH_ANY_CALL
> cmpi 0, 24, 0
> bcl 12, 2, success_3_1_3 # PERF_SAMPLE_BRANCH_ANY_CALL | PERF_SAMPLE_BRANCH_COND
>
> mtlr 26
> blr # PERF_SAMPLE_BRANCH_ANY_RET
> sw_3_2:
> # Print "Test: sw_3_2"
> li 0, 4
> li 3, 1
> lis 4, msg_3_2@ha
> addi 4, 4, msg_3_2@l
> li 5, len_3_1
> sc
>
> # FIXME: Anything more here ?
> blr # PERF_SAMPLE_BRANCH_ANY_RET
>
> # Indirect call tests
>
> # CTR
> ctr_addr:
> # Print "bcctr taken"
> li 0, 4
> li 3, 1
> lis 4, hw_4_1_passed@ha
> addi 4, 4, hw_4_1_passed@l
> li 5, len_hw_4_1_passed
> sc
>
> blr # PERF_SAMPLE_BRANCH_ANY_RET
> sw_4_1:
> # Save LR
> mflr 26
>
> # Print "sw_4_1 called"
> li 0, 4
> li 3, 1
> lis 4, msg_4_1@ha
> addi 4, 4, msg_4_1@l
> li 5, len_4_1
> sc
>
> # Save address in CTR
> lis 20, ctr_addr@ha
> addi 20, 20, ctr_addr@l
> mtctr 20
>
>
> # Compare and jump to CTR
> li 21, 10
> cmpi 0, 21, 10
> bcctrl 12, 4*cr0+2 # PERF_SAMPLE_BRANCH_IND_CALL
>
> mtlr 26
> blr # PERF_SAMPLE_BRANCH_ANY_RET
> # LR
> lr_addr:
> # Print "bclrl taken"
> li 0, 4
> li 3, 1
> lis 4, hw_4_2_passed@ha
> addi 4, 4, hw_4_2_passed@l
> li 5, len_hw_4_2_passed
> sc
>
> blr # PERF_SAMPLE_BRANCH_ANY_RET
>
> sw_4_2:
> # Save LR
> mflr 26
>
> # Print "Test: sw_4_2"
> li 0, 4
> li 3, 1
> lis 4, msg_4_2@ha
> addi 4, 4, msg_4_2@l
> li 5, len_4_2
> sc
>
> # Save address in LR
> lis 20, lr_addr@ha
> addi 20, 20, lr_addr@l
> mtlr 20
>
>
> # Compare and jump to CTR
> li 21, 10
> cmpi 0, 21, 10
> bclrl 12, 4*cr0+2 # PERF_SAMPLE_BRANCH_IND_CALL
>
> # Restore LR
> mtlr 26
> blr # PERF_SAMPLE_BRANCH_ANY_RET
>
> callme:
> # Save LR
> mflr 25
>
> # Print "Branch filter Test"
> li 0, 4
> li 3, 1
> lis 4, msg@ha
> addi 4, 4, msg@l
> li 5, len
> sc
>
> # PERF_SAMPLE_BRANCH_ANY_CALL
> bl hw_1_1 # PERF_SAMPLE_BRANCH_ANY_CALL
> bl hw_1_2 # PERF_SAMPLE_BRANCH_ANY_CALL
> # PERF_SAMPLE_BRANCH_COND
> bl hw_2_1 # PERF_SAMPLE_BRANCH_ANY_CALL
> bl hw_2_2 # PERF_SAMPLE_BRANCH_ANY_CALL
>
> # PERF_SAMPLE_BRANCH_ANY_RET
> bl sw_3_1 # PERF_SAMPLE_BRANCH_ANY_CALL
> bl sw_3_2 # PERF_SAMPLE_BRANCH_ANY_CALL
> # PERF_SAMPLE_BRANCH_IND_CALL
> bl sw_4_1 # PERF_SAMPLE_BRANCH_ANY_CALL
> bl sw_4_2 # PERF_SAMPLE_BRANCH_ANY_CALL
>
> # Restore LR
> mtlr 25
> blr # PERF_SAMPLE_BRANCH_ANY_RET
> --------------------------------------------------------------------
>
> Changes in V2
> --------------
> (1) Enabled PPC64 SW branch filtering support
> (2) Incorporated changes required for all previous comments
>
> Anshuman Khandual (6):
> perf: New conditional branch filter criteria in branch stack sampling
> powerpc, perf: Enable conditional branch filter for POWER8
> 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: Enable SW filtering in branch stack sampling framework
>
> arch/powerpc/include/asm/perf_event_server.h | 2 +-
> arch/powerpc/perf/core-book3s.c | 200 +++++++++++++++++++++++++--
> arch/powerpc/perf/power8-pmu.c | 25 ++--
> 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 +
> 7 files changed, 216 insertions(+), 23 deletions(-)
>
> --
> 1.7.11.7
>
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