Messages in this thread | | | Date | Tue, 9 Apr 2013 15:25:37 -0700 | From | Sukadev Bhattiprolu <> | Subject | perf --version inconsistency |
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Following commit replaced 'git describe' with 'git tag -l | tail -1' to speed up the build:
commit acddedfba0df1e47fa99035a04661082b679ee9c Author: Ingo Molnar <mingo@kernel.org> Date: Tue Oct 30 09:46:00 2012 +0100
perf tools: Speed up the perf build time by simplifying the perf --version string generation
If we checkout an older commit and build perf, the version reported by 'perf' ends up being inconsistent:
$ git describe v3.8-rc7
$ git show --pretty=short commit 836dc9e3fbbab0c30aa6e664417225f5c1fb1c39 Author: Linus Torvalds <torvalds@linux-foundation.org>
Linux 3.8-rc7
$ git tag -l | tail -1 v3.9-rc4
$ cd tools/perf; make perf
$ ./perf --version perf version 3.9.rc4.g836dc9e
where commit id '836dc9e' corresponds to 'v3.8-rc7' rather than '3.9.rc4'.
Is the tag reported by 'perf --version' meant to be approximate ?
Wonder if we can do anything on the 'git' side to cache the tag associated with HEAD and update the cache at each 'git checkout'. That could slow down 'git checkout' though.
Sukadev
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