Performance Monitoring Unit (PMU) registers in powerpc exports
number of cycles elapsed between different stages in the pipeline.
Example, sampling registers in ISA v3.1.
This patchset implements kernel and perf tools support to expose
these pipeline stage cycles using the sample type PERF_SAMPLE_WEIGHT_TYPE.
Patch 1/5 adds kernel side support to store the cycle counter
values as part of 'var2_w' and 'var3_w' fields of perf_sample_weight
structure.
Patch 2/5 adds support to make the perf report column header
strings as dynamic.
Patch 3/5 adds powerpc support in perf tools for PERF_SAMPLE_WEIGHT_STRUCT
in sample type: PERF_SAMPLE_WEIGHT_TYPE.
Patch 4/5 adds support to present pipeline stage cycles as part of
mem-mode.
Patch 5/5 is to display the new sort dimenstion in perf report columns
only on powerpc.
Sample output on powerpc:
# perf mem record ls
# perf mem report
# To display the perf.data header info, please use --header/--header-only
options.
#
#
# Total Lost Samples: 0
#
# Samples: 11 of event 'cpu/mem-loads/'
# Total weight : 1332
# Sort order :
local_weight,mem,sym,dso,symbol_daddr,dso_daddr,snoop,tlb,locked,blocked,local_ins_lat,stall_cyc
#
# Overhead Samples Local Weight Memory access Symbol
Shared Object Data Symbol
Data Object Snoop TLB access Locked
Blocked Finish Cyc Dispatch Cyc
# ........ ............ ............ ........................
.................................. ................
............................................. .....................
............ ...................... ...... .......... .............
.............
#
44.14% 1 588 L1 hit [k]
rcu_nmi_exit [kernel.vmlinux] [k] 0xc0000007ffdd21b0
[unknown] N/A N/A
No N/A 7 5
22.22% 1 296 L1 hit [k]
copypage_power7 [kernel.vmlinux] [k] 0xc0000000ff6a1780
[unknown] N/A N/A
No N/A 293 3
6.98% 1 93 L1 hit [.] _dl_addr
libc-2.31.so [.] 0x00007fff86fa5058
libc-2.31.so N/A N/A No
N/A 7 1
6.61% 1 88 L2 hit [.]
new_do_write libc-2.31.so [.] _IO_2_1_stdout_+0x0
libc-2.31.so N/A N/A
No N/A 84 1
5.93% 1 79 L1 hit [k]
printk_nmi_exit [kernel.vmlinux] [k] 0xc0000006085df6b0
[unknown] N/A N/A
No N/A 7 1
4.05% 1 54 L2 hit [.]
__alloc_dir libc-2.31.so [.] 0x00007fffdb70a640
[stack] N/A N/A
No N/A 18 1
3.60% 1 48 L1 hit [.] _init
ls [.] 0x000000016ca82118
[heap] N/A N/A No
N/A 7 6
2.40% 1 32 L1 hit [k] desc_read
[kernel.vmlinux] [k] _printk_rb_static_descs+0x1ea10
[kernel.vmlinux].data N/A N/A No
N/A 7 1
1.65% 1 22 L2 hit [k]
perf_iterate_ctx.constprop.139 [kernel.vmlinux] [k] 0xc00000064d79e8a8
[unknown] N/A N/A
No N/A 16 1
1.58% 1 21 L1 hit [k]
perf_event_interrupt [kernel.vmlinux] [k] 0xc0000006085df6b0
[unknown] N/A N/A
No N/A 7 1
0.83% 1 11 L1 hit [k]
perf_event_exec [kernel.vmlinux] [k] 0xc0000007ffdd3288
[unknown] N/A N/A
No N/A 7 4
Changelog:
Changes from v1 -> v2
Addressed Jiri's review comments:
- Display the new sort dimension 'p_stage_cyc' only
on supported architecture.
- Check for arch specific header string for matching
sort order in patch2.
Athira Rajeev (5):
powerpc/perf: Expose processor pipeline stage cycles using
PERF_SAMPLE_WEIGHT_STRUCT
tools/perf: Add dynamic headers for perf report columns
tools/perf: Add powerpc support for PERF_SAMPLE_WEIGHT_STRUCT
tools/perf: Support pipeline stage cycles for powerpc
tools/perf: Display sort dimension p_stage_cyc only on supported archs
arch/powerpc/include/asm/perf_event_server.h | 2 +-
arch/powerpc/perf/core-book3s.c | 4 +-
arch/powerpc/perf/isa207-common.c | 29 ++++++++++++--
arch/powerpc/perf/isa207-common.h | 6 ++-
tools/perf/Documentation/perf-report.txt | 2 +
tools/perf/arch/powerpc/util/Build | 2 +
tools/perf/arch/powerpc/util/event.c | 53 ++++++++++++++++++++++++
tools/perf/arch/powerpc/util/evsel.c | 8 ++++
tools/perf/util/event.h | 3 ++
tools/perf/util/hist.c | 11 +++--
tools/perf/util/hist.h | 1 +
tools/perf/util/session.c | 4 +-
tools/perf/util/sort.c | 60 +++++++++++++++++++++++++++-
tools/perf/util/sort.h | 2 +
14 files changed, 174 insertions(+), 13 deletions(-)
create mode 100644 tools/perf/arch/powerpc/util/event.c
create mode 100644 tools/perf/arch/powerpc/util/evsel.c
--
1.8.3.1
