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91dcfae0ff
By default when users program perf to sample branch instructions (PERF_COUNT_HW_BRANCH_INSTRUCTIONS) with a sample period of 1, perf interprets this as a special case and enables BTS (Branch Trace Store) as an optimization to avoid taking an interrupt on every branch. Since BTS doesn't virtualize, this optimization doesn't make sense when the request originates from a guest. Add an additional check that prevents this optimization for virtualized events (exclude_host). Reported-by: Jan H. Schönherr <jschoenh@amazon.de> Suggested-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Fernand Sieber <sieberf@amazon.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: <stable@vger.kernel.org> Link: https://patch.msgid.link/20251211183604.868641-1-sieberf@amazon.com |
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| .. | ||
| amd | ||
| intel | ||
| zhaoxin | ||
| core.c | ||
| Kconfig | ||
| Makefile | ||
| msr.c | ||
| perf_event.h | ||
| perf_event_flags.h | ||
| probe.c | ||
| probe.h | ||
| rapl.c | ||
| utils.c | ||