Hi Adrian,
Just noticed that starting from Linux v4.2-rc1 +ACI-perf record+ACI-
doesn't work on ARC. That's what I see:
------------+AD4-8------------
+ACM- perf record ls -la
Cannot use AUX area tracing mmaps
failed to mmap with 38 (Function not implemented)
------------+AD4-8------------
I believe that happens because by default auxtrace is enabled
(NO+AF8-AUXTRACE+AD0-0) and so auxtrace+AF8-mmap+AF8AXw-mmap() from
+ACI-tools/perf/util/auxtrace.c+ACI- gets compiled in and following
check fails:
------------+AD4-8------------
+ACM-if BITS+AF8-PER+AF8-LONG +ACEAPQ- 64 +ACYAJg- +ACE-defined(HAVE+AF8-SYNC+AF8-COMPARE+AF8-AND+AF8-SWAP+AF8-SUPPORT)
pr+AF8-err(+ACI-Cannot use AUX area tracing mmaps+AFw-n+ACI-)+ADs-
return -1+ADs-
+ACM-endif
------------+AD4-8------------
Unfortunately we don't have +AF8AXw-sync+AF8-val+AF8-compare+AF8-and+AF8-swap()
in our current toolchain. And ARC as of today is 32-bit architecture.
Now if I pass NO+AF8-AUXTRACE+AD0-1 in perf building command then everything
works as expected.
So I'm wondering what would be the best way to get perf properly
working for ARC (at least) and probably other architecture/toolchain
combos?
I see at least 2 options:
+AFs-1+AF0- Add feature check for BITS+AF8-PER+AF8-LONG. And then if
+ACI-BITS+AF8-PER+AF8-LONG +ACEAPQ- 32 +ACY- HAVE+AF8-SYNC+AF8-COMPARE+AF8-AND+AF8-SWAP+AF8-SUPPORT+ACI-
automatically set +ACI-NO+AF8-AUXTRACE+AD0-1+ACI- on building perf.
+AFs-2+AF0- By default enable auxtrace only on selected architectures.
For example Intel 64-bit and maybe others who really capable of
running auxtrace (and may make use of it).
Any suggestions are much appreciated.
Just in case that's my back-trace to auxtrace+AF8-mmap+AF8AXw-mmap():
------------+AD4-8------------
+ACM-0 auxtrace+AF8-mmap+AF8AXw-mmap (mm+AD0-0x11a1a44, mp+AD0-0x5fa468c0, userpg+AD0-0x2021e000, fd+AD0-4)
at util/auxtrace.c:57
+ACM-1 0x0005d3b0 in +AF8AXw-perf+AF8-evlist+AF8AXw-mmap (evlist+AD0-0x11a0f30, evlist+AD0-0x11a0f30,
fd+AD0-4, mp+AD0-0x5fa468b8, idx+AD0-0) at util/evlist.c:838
+ACM-2 perf+AF8-evlist+AF8AXw-mmap+AF8-per+AF8-evsel (evlist+AD0-evlist+AEA-entry+AD0-0x11a0f30,
idx+AD0-idx+AEA-entry+AD0-0, mp+AD0-mp+AEA-entry+AD0-0x5fa468b8, cpu+AD0-cpu+AEA-entry+AD0-0,
thread+AD0-thread+AEA-entry+AD0-0, output+AD0-output+AEA-entry+AD0-0x5fa468b4) at util/evlist.c:861
+ACM-3 0x0005de1e in perf+AF8-evlist+AF8AXw-mmap+AF8-per+AF8-cpu (mp+AD0-0x5fa468b8, evlist+AD0-0x11a0f30)
at util/evlist.c:910
+ACM-4 perf+AF8-evlist+AF8AXw-mmap+AF8-ex (evlist+AD0-0x11a0f30, evlist+AEA-entry+AD0-0x0,
pages+AD0APA-optimized out+AD4-, overwrite+AD0-overwrite+AEA-entry+AD0-false, auxtrace+AF8-pages+AD0-0,
auxtrace+AF8-overwrite+AD0APA-optimized out+AD4-) at util/evlist.c:1095
+ACM-5 0x0001e906 in record+AF8AXw-open (rec+AD0-0xf11a0 +ADw-record+AD4-) at builtin-record.c:305
+ACM-6 +AF8AXw-cmd+AF8-record (rec+AD0-0xf11a0 +ADw-record+AD4-, argv+AD0APA-optimized out+AD4-,
argc+AD0APA-optimized out+AD4-) at builtin-record.c:519
+ACM-7 cmd+AF8-record (argc+AD0APA-optimized out+AD4-, argv+AD0APA-optimized out+AD4-,
prefix+AD0APA-optimized out+AD4-) at builtin-record.c:1168
+ACM-8 0x00053758 in run+AF8-builtin (p+AD0-p+AEA-entry+AD0-0xf2938 +ADw-commands+-72+AD4-,
argc+AD0-argc+AEA-entry+AD0-2, argv+AD0-argv+AEA-entry+AD0-0x11a1730) at perf.c:370
+ACM-9 0x00053f10 in handle+AF8-internal+AF8-command (argv+AD0-0x11a1730, argc+AD0-2)
at perf.c:429
+ACM-10 run+AF8-argv (argv+AD0-0x5fa47c70, argcp+AD0-0x5fa47c74) at perf.c:473
+ACM-11 main (argc+AD0-2, argv+AD0-0x5fa47d98) at perf.c:588
------------+AD4-8------------
-Alexey--
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