From: Ingo Molnar Date: Fri, 16 Jun 2017 19:33:48 +0000 (+0200) Subject: Merge tag 'perf-urgent-for-mingo-4.12-20170616' of git://git.kernel.org/pub/scm/linux... X-Git-Tag: v4.12-rc6~9^2 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=531c221df182af5a7fc2bf7ba7eee89354fe9a10;p=linux.git Merge tag 'perf-urgent-for-mingo-4.12-20170616' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/urgent Pull perf/urgent fixes from Arnaldo Carvalho de Melo: - Fix probing of precise_ip level for default cycles event, that got broken recently on x86_64 when its arch code started considering invalid requesting precise samples when not sampling (i.e. when attr.sample_period == 0). This also fixes another problem in s/390 where the precision probing with sample_period == 0 returned precise_ip > 0, that then, when setting up the real cycles event (not probing) would return EOPNOTSUPP for precise_ip > 0 (as determined previously by probing) and sample_period > 0. These problems resulted in attr_precise not being set to the highest precision available on x86.64 when no event was specified, i.e. the canonical: perf record ./workload would end up using attr.precise_ip = 0. As a workaround this would need to be done: perf record -e cycles:P ./workload And on s/390 it would plain not work, requiring using: perf record -e cycles ./workload as a workaround. (Arnaldo Carvalho de Melo) - Fix perf build with ARCH=x86_64, when ARCH should be transformed into ARCH=x86, just like with the main kernel Makefile and tools/objtool's, i.e. use SRCARCH. (Jiada Wang) - Avoid accessing uninitialized data structures when unwinding with elfutils's libdw, making it more closely mimic libunwind's unwinder. (Milian Wolff) Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: Ingo Molnar --- 531c221df182af5a7fc2bf7ba7eee89354fe9a10