• Steve MacLean's avatar
    perf map: Fix overlapped map handling · ee212d6e
    Steve MacLean authored
    Whenever an mmap/mmap2 event occurs, the map tree must be updated to add a new
    entry. If a new map overlaps a previous map, the overlapped section of the
    previous map is effectively unmapped, but the non-overlapping sections are
    still valid.
    
    maps__fixup_overlappings() is responsible for creating any new map entries from
    the previously overlapped map. It optionally creates a before and an after map.
    
    When creating the after map the existing code failed to adjust the map.pgoff.
    This meant the new after map would incorrectly calculate the file offset
    for the ip. This results in incorrect symbol name resolution for any ip in the
    after region.
    
    Make maps__fixup_overlappings() correctly populate map.pgoff.
    
    Add an assert that new mapping matches old mapping at the beginning of
    the after map.
    
    Committer-testing:
    
    Validated correct parsing of libcoreclr.so symbols from .NET Core 3.0 preview9
    (which didn't strip symbols).
    
    Preparation:
    
      ~/dotnet3.0-preview9/dotnet new webapi -o perfSymbol
      cd perfSymbol
      ~/dotnet3.0-preview9/dotnet publish
      perf record ~/dotnet3.0-preview9/dotnet \
          bin/Debug/netcoreapp3.0/publish/perfSymbol.dll
      ^C
    
    Before:
    
      perf script --show-mmap-events 2>&1 | grep -e MMAP -e unknown |\
         grep libcoreclr.so | head -n 4
            dotnet  1907 373352.698780: PERF_RECORD_MMAP2 1907/1907: \
                [0x7fe615726000(0x768000) @ 0 08:02 5510620 765057155]: \
                r-xp .../3.0.0-preview9-19423-09/libcoreclr.so
            dotnet  1907 373352.701091: PERF_RECORD_MMAP2 1907/1907: \
                [0x7fe615974000(0x1000) @ 0x24e000 08:02 5510620 765057155]: \
                rwxp .../3.0.0-preview9-19423-09/libcoreclr.so
            dotnet  1907 373352.701241: PERF_RECORD_MMAP2 1907/1907: \
                [0x7fe615c42000(0x1000) @ 0x51c000 08:02 5510620 765057155]: \
                rwxp .../3.0.0-preview9-19423-09/libcoreclr.so
            dotnet  1907 373352.705249:     250000 cpu-clock: \
                 7fe6159a1f99 [unknown] \
                 (.../3.0.0-preview9-19423-09/libcoreclr.so)
    
    After:
    
      perf script --show-mmap-events 2>&1 | grep -e MMAP -e unknown |\
         grep libcoreclr.so | head -n 4
            dotnet  1907 373352.698780: PERF_RECORD_MMAP2 1907/1907: \
                [0x7fe615726000(0x768000) @ 0 08:02 5510620 765057155]: \
                r-xp .../3.0.0-preview9-19423-09/libcoreclr.so
            dotnet  1907 373352.701091: PERF_RECORD_MMAP2 1907/1907: \
                [0x7fe615974000(0x1000) @ 0x24e000 08:02 5510620 765057155]: \
                rwxp .../3.0.0-preview9-19423-09/libcoreclr.so
            dotnet  1907 373352.701241: PERF_RECORD_MMAP2 1907/1907: \
                [0x7fe615c42000(0x1000) @ 0x51c000 08:02 5510620 765057155]: \
                rwxp .../3.0.0-preview9-19423-09/libcoreclr.so
    
    All the [unknown] symbols were resolved.
    Signed-off-by: default avatarSteve MacLean <Steve.MacLean@Microsoft.com>
    Tested-by: default avatarBrian Robbins <brianrob@microsoft.com>
    Acked-by: default avatarJiri Olsa <jolsa@kernel.org>
    Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
    Cc: Andi Kleen <ak@linux.intel.com>
    Cc: Davidlohr Bueso <dave@stgolabs.net>
    Cc: Eric Saint-Etienne <eric.saint.etienne@oracle.com>
    Cc: John Keeping <john@metanate.com>
    Cc: John Salem <josalem@microsoft.com>
    Cc: Leo Yan <leo.yan@linaro.org>
    Cc: Mark Rutland <mark.rutland@arm.com>
    Cc: Namhyung Kim <namhyung@kernel.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Song Liu <songliubraving@fb.com>
    Cc: Stephane Eranian <eranian@google.com>
    Cc: Tom McDonald <thomas.mcdonald@microsoft.com>
    Link: http://lore.kernel.org/lkml/BN8PR21MB136270949F22A6A02335C238F7800@BN8PR21MB1362.namprd21.prod.outlook.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
    ee212d6e
map.c 22.7 KB