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cpumf/pai: Handle perf records type PERF_RECORD_SWITCH

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Running command pai -r <file> might encounter entries of type
PERF_RECORD_SWITCH. Entries of that type are currently not handled
and cause an error message:

 # pai -r ~/paicrypto.000
 unknown header-type 14 unknown header-type 14 \
 unknown header-type 14 ...

The error message is not terminated by a newline.

Handle entries of this type PERF_RECORD_SWITCH. These records
do not carry any payload at all, just a bit is set in the
header::misc member. This bit set determines context switch out.

Output after:
 # ./pai -r ~/paicrypto.000
 0x4b814018f4f3 6 cs-out
 0x4b817bc3c936 6 cs-in
 0x4b817bc5246c 6 cs-out
 0x4b817bd90e9a 6 cs-in
 ....
 #

Signed-off-by: Thomas Richter <tmricht@linux.ibm.com>
Acked-by: Sumanth Korikkar <sumanthk@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
This commit is contained in:
Thomas Richter
2024-01-10 15:24:09 +01:00
committed by Jan Höppner
parent 90ddef5a41
commit 64d4e02b4f
1 changed files with 9 additions and 1 deletions
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10
cpumf/pai.c
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@@ -449,6 +449,11 @@ static void evt_show(__u64 evtnum, const char *evtsel, struct pai_event_out *ev)
ev->u.s_comm.tid);
break;
case PERF_RECORD_SWITCH:
printf("cs-%s",
(ev->misc & PERF_RECORD_MISC_SWITCH_OUT) ? "out" : "in");
break;
case PERF_RECORD_SWITCH_CPU_WIDE:
if (ev->misc & PERF_RECORD_MISC_SWITCH_OUT) {
short p = PERF_RECORD_MISC_SWITCH_OUT_PREEMPT;
@@ -549,6 +554,9 @@ static int evt_scan(char *fn, unsigned char *buf, size_t len,
offset -= sizeof(__u64);
break;
case PERF_RECORD_SWITCH:
break;
case PERF_RECORD_SWITCH_CPU_WIDE:
memcpy(&ev.u, buf + offset, sizeof(ev.u.s_cs));
offset += sizeof(ev.u.s_cs);
@@ -583,7 +591,7 @@ static int evt_scan(char *fn, unsigned char *buf, size_t len,
break;
default:
printf("unknown header-type %d ", hdr->type);
printf("unknown header-type %d\n", hdr->type);
offset += hdr->size - sizeof(*hdr);
goto bypass;
}