perf: Add irq and exception return branch types

This expands generic branch type classification by adding two more entries there in i.e irq and exception return. Also updates the x86 implementation to process X86_BR_IRET and X86_BR_IRQ records as appropriate. This changes branch types reported to user space on x86 platform but it should not be a problem. The possible scenarios and impacts are enumerated here.

Anshuman Khandual committed 4 years ago

Commit cedd3611 parent 71a412e4 files · +9 −3Browse files

Showing the changes to include/uapi (1 of 4 files). Show all

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include/uapi/linux/perf_event.h+2−0

@@ -251,6 +251,8 @@ enum { · 250 unmodified lines
251	PERF_BR_SYSRET = 8, /* syscall return */	251	PERF_BR_SYSRET = 8, /* syscall return */
252	PERF_BR_COND_CALL = 9, /* conditional function call */	252	PERF_BR_COND_CALL = 9, /* conditional function call */
253	PERF_BR_COND_RET = 10, /* conditional function return */	253	PERF_BR_COND_RET = 10, /* conditional function return */
		254	PERF_BR_ERET = 11, /* exception return */
		255	PERF_BR_IRQ = 12, /* irq */
254	PERF_BR_MAX,	256	PERF_BR_MAX,
255	};	257	};
256		258