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perf: Add irq and exception return branch types

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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.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/1645681014-3346-1-git-send-email-anshuman.khandual@arm.com
This commit is contained in:
Anshuman Khandual 2022-02-24 11:06:54 +05:30 committed by Peter Zijlstra
parent 71a412ed4c
commit cedd3614e5
4 changed files with 9 additions and 3 deletions
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4
arch/x86/events/intel/lbr.c
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@ -1329,10 +1329,10 @@ static int branch_map[X86_BR_TYPE_MAP_MAX] = {
PERF_BR_SYSCALL, /* X86_BR_SYSCALL */
PERF_BR_SYSRET, /* X86_BR_SYSRET */
PERF_BR_UNKNOWN, /* X86_BR_INT */
PERF_BR_UNKNOWN, /* X86_BR_IRET */
PERF_BR_ERET, /* X86_BR_IRET */
PERF_BR_COND, /* X86_BR_JCC */
PERF_BR_UNCOND, /* X86_BR_JMP */
PERF_BR_UNKNOWN, /* X86_BR_IRQ */
PERF_BR_IRQ, /* X86_BR_IRQ */
PERF_BR_IND_CALL, /* X86_BR_IND_CALL */
PERF_BR_UNKNOWN, /* X86_BR_ABORT */
PERF_BR_UNKNOWN, /* X86_BR_IN_TX */

2
include/uapi/linux/perf_event.h
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@ -251,6 +251,8 @@ enum {
PERF_BR_SYSRET = 8, /* syscall return */
PERF_BR_COND_CALL = 9, /* conditional function call */
PERF_BR_COND_RET = 10, /* conditional function return */
PERF_BR_ERET = 11, /* exception return */
PERF_BR_IRQ = 12, /* irq */
PERF_BR_MAX,
};

2
tools/include/uapi/linux/perf_event.h
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@ -251,6 +251,8 @@ enum {
PERF_BR_SYSRET = 8, /* syscall return */
PERF_BR_COND_CALL = 9, /* conditional function call */
PERF_BR_COND_RET = 10, /* conditional function return */
PERF_BR_ERET = 11, /* exception return */
PERF_BR_IRQ = 12, /* irq */
PERF_BR_MAX,
};

4
tools/perf/util/branch.c
View File

@ -49,7 +49,9 @@ const char *branch_type_name(int type)
"SYSCALL",
"SYSRET",
"COND_CALL",
"COND_RET"
"COND_RET",
"ERET",
"IRQ"
};
if (type >= 0 && type < PERF_BR_MAX)