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tag nameperf-core-for-mingo-20160525 (b4efc3c33a39d72901fed2f62acb0b9da68ebbab)
tag date2016-05-25 17:30:19 -0300
tagged byArnaldo Carvalho de Melo <acme@redhat.com>
tagged objectcommit 83e1e314ba...
perf/core improvements and fixes:
User visible/kernel ABI: - Per event callchain limit: Recently we introduced a sysctl to tune the max-stack for all events for which callchains were requested: $ sysctl kernel.perf_event_max_stack kernel.perf_event_max_stack = 127 Now this patch introduces a way to configure this per event, i.e. this becomes possible: $ perf record -e sched:*/max-stack=2/ -e block:*/max-stack=10/ -a allowing finer tuning of how much buffer space callchains use. This uses an u16 from the reserved space at the end, leaving another u16 for future use. There has been interest in even finer tuning, namely to control the max stack for kernel and userspace callchains separately. Further discussion is needed, we may for instance use the remaining u16 for that and when it is present, assume that the sample_max_stack introduced in this patch applies for the kernel, and the u16 left is used for limiting the userspace callchain. (Arnaldo Carvalho de Melo) - Fix kptr_restrict=2 related 'perf record' segfault (Wang Nan) Infrastructure; - Adopt get_main_thread from db-export.c (Andi Kleen) - More prep work for backward ring buffer support (Wang Nan) Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQIcBAABCAAGBQJXRg6TAAoJENZQFvNTUqpABgkP/1bGqUXA7j224mkE6jpY5DYm uAIl6mRk1ZUl2Gm6l+kN6UmsRS/MnbAYENnrCZJxWtq3C8HYaYfn/Wpi2eZzX+q8 n5HzUps7a8Of+K9aug4fzV+G55mSkFH50NKEdq/rRD+QossTP8o4/Bj3/7R0xC4i nEJvZOuuqM+COZQ29fYgAXNMMhzfspOvOBeTv0kfuEqmuIqIPMxqmZMKYGwH+Tij QNpEMzCwUupND6B3/sfy7+nKpveGsikPva8QfaE5k4ii0NCx9Zqpty0EO6Fo6p1L uoxtBazjYaPgSBkM16L83yDE0LkUoT5EdNbkdnu/J9om2Jot9/knKxi60yGOxHGn sf2d0xrQ9nCHQ6KIHsf+g7Ck4LefNsz7+hyG2m/7jZLYhAtOlztE6Fe7W0VuhdE3 ASdeZyFWKQV138DW1B15XE56+t7tjUXdpCT+o8ZxqfvVhQSYfYGm/TLY//islela bUOmEm9OQmh/KiAvKaGkdMhEEa60JAWPp8QBxGT19H8TPJYF6T/zeLmfAVteEy+r l3ZRKc9sWW4+03JJ6FV3+JS3u+zL+taY0dWuRCzdV3+eTvMu4dfQ4TBkxlteozO7 ZPCyTK4RQMTUme5W8tftjmGNd2fe/AnSLxgpoYGX9w535OjaDdWbQZTe53uMmXbX 624UGxXJLaIg2Jlvvvpx =xJpT -----END PGP SIGNATURE-----