From 380b5143ab76de71572c7a30e68c8e22b94bee52 Mon Sep 17 00:00:00 2001 From: Namhyung Kim Date: Mon, 6 Oct 2014 09:46:01 +0900 Subject: perf callchain: Use global caching provided by libunwind The libunwind provides two caching policy which are global and per-thread. As perf unwinds callchains in a single thread, it'd sufficient to use global caching. This speeds up my perf report from 14s to 7s on a ~260MB data file. Although the output sometimes contains a slight difference (~0.01% in terms of number of lines printed) on callchains which were not resolved. Signed-off-by: Namhyung Kim Acked-by: Jean Pihet Cc: Arun Sharma Cc: David Ahern Cc: Frederic Weisbecker Cc: Ingo Molnar Cc: Jean Pihet Cc: Jiri Olsa Cc: Namhyung Kim Cc: Paul Mackerras Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/1412556363-26229-4-git-send-email-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/unwind-libunwind.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'tools/perf/util/unwind-libunwind.c') diff --git a/tools/perf/util/unwind-libunwind.c b/tools/perf/util/unwind-libunwind.c index e060386165c5..4d45c0dfe343 100644 --- a/tools/perf/util/unwind-libunwind.c +++ b/tools/perf/util/unwind-libunwind.c @@ -539,11 +539,23 @@ int unwind__prepare_access(struct thread *thread) return -ENOMEM; } + unw_set_caching_policy(addr_space, UNW_CACHE_GLOBAL); thread__set_priv(thread, addr_space); return 0; } +void unwind__flush_access(struct thread *thread) +{ + unw_addr_space_t addr_space; + + if (callchain_param.record_mode != CALLCHAIN_DWARF) + return; + + addr_space = thread__priv(thread); + unw_flush_cache(addr_space, 0, 0); +} + void unwind__finish_access(struct thread *thread) { unw_addr_space_t addr_space; -- cgit v1.2.3-59-g8ed1b