tree 9fc86da826ae51db0aa1b4abb87e6a0935696ead
parent a0065ca64273e26cd90b76fb9acfc4c742355936
author Namhyung Kim <namhyung@kernel.org> 1418887747 +0900
committer Namhyung Kim <namhyung@kernel.org> 1419378162 +0900

perf tools: Add front cache for dso data access

There's a high contention in dso_cache__find() due to the dso->lock
when dwarf unwinding is done with libunwind.  Add last accessed
pointers of dso_cache to lockless lookup.  It'll fallback to normal
tree search when it misses the last cache.

The size 16 is arbitrary and works best for my setting.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>