[PATCH 0/4] perf: memory load/store events generalization

[Lin Ming]

Hi, all

Intel PMU provides 2 facilities to monitor memory operation: load latency and precise store.
This patchset tries to generalize memory load/store events.
So other arches may also add such features.

A new sub-command "mem" is added,

$ perf mem

 usage: perf mem [<options>] {record <command> |report}

    -t, --type <type>     memory operations(load/store)
    -L, --latency <n>     latency to sample(only for load op)

$ perf mem -t load record make -j8

<building kernel ..., monitoring memory load opeartion>

$ perf mem -t load report

Memory load operation statistics
================================
                      L1-local: total latency=   28027, count=    3355(avg=8)
                      L2-snoop: total latency=    1430, count=      29(avg=49)
                      L2-local: total latency=     124, count=       8(avg=15)
             L3-snoop, found M: total latency=     452, count=       4(avg=113)
          L3-snoop, found no M: total latency=       0, count=       0(avg=0)
L3-snoop, no coherency actions: total latency=     875, count=      18(avg=48)
        L3-miss, snoop, shared: total latency=       0, count=       0(avg=0)
     L3-miss, local, exclusive: total latency=       0, count=       0(avg=0)
        L3-miss, local, shared: total latency=       0, count=       0(avg=0)
    L3-miss, remote, exclusive: total latency=       0, count=       0(avg=0)
       L3-miss, remote, shared: total latency=       0, count=       0(avg=0)
                    Unknown L3: total latency=       0, count=       0(avg=0)
                            IO: total latency=       0, count=       0(avg=0)
                      Uncached: total latency=     464, count=      30(avg=15)

$ perf mem -t store record make -j8

<building kernel ..., monitoring memory store opeartion>

$ perf mem -t store report

Memory store operation statistics
=================================
                data-cache hit:     8138
               data-cache miss:        0
                      STLB hit:     8138
                     STLB miss:        0
                 Locked access:        0
               Unlocked access:     8138

Any comment is appreciated.

Thanks,
Lin Ming
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