tag nameperf-urgent-for-mingo-4.12-20170616 (7211a4b68cedd279eca94db959ff7895baf7886d)
tag date2017-06-16 15:28:51 -0300
tagged byArnaldo Carvalho de Melo <acme@redhat.com>
tagged objectcommit 9126cbbace...
perf/urgent fixes:
- 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 <acme@redhat.com> -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQIcBAABCAAGBQJZRCRCAAoJENZQFvNTUqpAQ/gP/2JLe5ZAIxybFIuCnoiO5uCT mJ5R6222pi2Nk21n+ys5Fo0/vp5Tu8eGUj30tFvNJ9jh7Ut1aIJNuxgEy7moJn59 biniX35ttX/a67WK5wZ1rdH5ATzoZWpSESStiAMiGdNEmUaTGn8k3xA++HflJNq4 aYCYAD2UabfKo61ZfRzpgtHf5dr6y1WQ3mVS+1CwoezMHxhBEMcyv1hvKO+u1JIW n59bgFaVlomg8jaEyRSIZsuvUr2Sy8EUoO6U8IH+ghqcLoiBxxKT4Q9rScKbef0J ZRgO01ntuorJSiE55WB4yA0oSmfl7nWdbO2XbDQs/Wp7tjTc+CAmtDGBUxM1cg6t 5ibuiMRjaA/2zI9qH2LbYLmno/PeS9t6PW9RpTLWIrjv4IF2p3pCJLECUY9GWZqD HdUOcxmXxItkeTKxibK4eFg7of07bh/Z9REWxo5+sSyQnb/AJ/kkrGdtWOyeSzhy 2yKpbt+ZAvsr9KGvLmO0cjMxmeaoFY94SBHVmxto9+87t3X/1Bz/C9r4a34Kz05c ia7MNz04je3v4DuauOvB28vxRHUaLNacDGhiH8eKVb/mE51I9yoWFCOmFE70/OUd NOPv7/i4CxnrHe8dVQrapm9YY2i9F2BUWEuzseA+kmPAK0So6baMBbmq4T+DfT2I kQw3gMUQ9GBWp8STn4Vo =vT1k -----END PGP SIGNATURE-----