linux-kernel - [PATCH 0/8]powerpc/perf: Export memory hierarchy level

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Date:	Thu, 11 Jun 2015 14:13:29 +0530
From:	Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>
To:	benh@...nel.crashing.org, paulus@...ba.org, mpe@...erman.id.au
Cc:	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	sukadev@...ux.vnet.ibm.com, eranian@...gle.com,
	khandual@...ux.vnet.ibm.com, rusty@...tcorp.com.au,
	Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>
Subject: [PATCH 0/8]powerpc/perf: Export memory hierarchy level

Power8 Perforence Monitoring Unit (PMU) supports different
sampling modes (SM) Random Instruction Sampling (RIS),
Random Load/Store Facility Sampling (RLS) and Random Branch
Sampling (RBS). This patchset enabled RLS mode to mark
Load/Store instructions to save the memory hierarchy level
(eg: L2, L3) for cache reload. Event used here to sample
is "marked instruction complete".

This patchset exports the hierarchy information to the user via the
perf_mem_data_src object. Patchset is based on and derived from
Sukadev Bhattiprolu work[1]. It exports the memory hierarchy
information only to Power8 processor based system, since
similiar event or modes are not supported in Power7

[1]:https://lkml.org/lkml/2013/10/15/858

perf interface sample. Workload used here is "ebizzy"

# perf report -n --mem-mode --sort=mem,sym,dso,symbol_daddr --stdio
# To display the perf.data header info, please use --header/--header-only options.
#
# Samples: 33  of event 'cpu/mem_access/'
# Total weight : 33
# Sort order   : mem,sym,dso,symbol_daddr
#
# Overhead       Samples             Memory access                              Symbol      Shared Object                                Data Symbol
# ........  ............  ........................  ..................................  .................  .........................................
#
    12.12%             4  L2 hit                    [k] __do_softirq                    [kernel.kallsyms]  [k] softirq_vec+0x8
     6.06%             2  L2 hit                    [k] __schedule                      [kernel.kallsyms]  [k] 0xc0000003bb975df0
     6.06%             2  Remote Cache (1 hop) hit  [k] scheduler_tick                  [kernel.kallsyms]  [k] 0xc0000003feb1e4b0
     3.03%             1  L2 hit                    [k] __acct_update_integrals         [kernel.kallsyms]  [k] 0xc0000003b79d8a30
     3.03%             1  L2 hit                    [.] __memcpy_power7                 libc-2.17.so       [.] 0x0000010021349b00
     3.03%             1  L2 hit                    [.] __memcpy_power7                 libc-2.17.so       [.] 0x000001002134a030
     3.03%             1  L2 hit                    [k] __mmdrop                        [kernel.kallsyms]  [k] pgtable_cache+0x58
     3.03%             1  L2 hit                    [k] __update_cpu_load               [kernel.kallsyms]  [k] 0xc0000003feb1dc60
     3.03%             1  L2 hit                    [.] _int_malloc                     libc-2.17.so       [.] 0x00003fff90000090
     3.03%             1  L2 hit                    [k] account_system_time             [kernel.kallsyms]  [k] 0xc0000003feb08088
.....

Madhavan Srinivasan (8):
 powerpc/perf: Remove PME_ prefix for power7 events
 powerpc/perf: Export Power8 generic events in sysfs
 powerpc/perf: EVENT macro for exporting generic events
 powerpc/perf: Add Power8 mem_access event to sysfs
 powerpc/perf: Define big-endian version of perf_mem_data_src
 powerpc/perf: Export Power8 memory hierarchy info to user space
 powerpc/perf: Set data source value
 powerpc/perf: cleanup in perf_event_print_debug()

 arch/powerpc/include/asm/perf_event_server.h |  4 +-
 arch/powerpc/perf/core-book3s.c              | 17 ++++-
 arch/powerpc/perf/power7-pmu.c               | 18 ++---
 arch/powerpc/perf/power8-events-list.h       | 21 ++++++
 arch/powerpc/perf/power8-pmu.c               | 98 ++++++++++++++++++++++++++--
 include/uapi/linux/perf_event.h              | 16 +++++
 6 files changed, 155 insertions(+), 19 deletions(-)
 create mode 100644 arch/powerpc/perf/power8-events-list.h

-- 
1.9.1

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