Messages in this thread | | | Date | Fri, 02 Oct 2015 14:25:53 -0700 | From | "Shi, Yang" <> | Subject | Re: [PATCH] perf: change samples type to unsigned long long |
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On 10/2/2015 12:10 PM, Arnaldo Carvalho de Melo wrote: > Em Fri, Oct 02, 2015 at 04:08:38PM -0300, Arnaldo Carvalho de Melo escreveu: >> Em Tue, Sep 29, 2015 at 02:49:43PM -0700, Yang Shi escreveu: >>> When run "perf record -e", the number of samples showed up is wrong on some >>> 32 bit systems, i.e. powerpc and arm. >>> >>> For example, run the below commands on 32 bit powerpc: >>> >>> perf probe -x /lib/libc.so.6 malloc >>> perf record -e probe_libc:malloc -a ls >>> perf.data >>> [ perf record: Woken up 1 times to write data ] >>> [ perf record: Captured and wrote 0.036 MB perf.data (13829241621624967218 samples) ] >>> >>> Actually, "perf script" just shows 21 samples. The number of samples is also >>> absurd since samples is long type, but it is printed as PRIu64. >>> >>> Build test is run on x86-64, x86, aarch64, arm, mips, ppc and ppc64. >> >> Sure? >> >> AR /tmp/build/perf/libperf.a >> builtin-record.c: In function ‘__cmd_record’: >> builtin-record.c:689:12: error: comparison between signed and unsigned >> integer expressions [-Werror=sign-compare] > > You missed something important, I am fixing this and applying your > patch:
Thanks a lot. Yes, it was wrong, however, my compiler just throws a warning instead of an error. And, the warning was hidden by my OE build environment.
Regards, Yang
> > diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c > index 974065f8ce80..24ace2f318c1 100644 > --- a/tools/perf/builtin-record.c > +++ b/tools/perf/builtin-record.c > @@ -667,7 +667,7 @@ static int __cmd_record(struct record *rec, int argc, const char **argv) > > auxtrace_snapshot_enabled = 1; > for (;;) { > - int hits = rec->samples; > + unsigned long long hits = rec->samples; > > if (record__mmap_read_all(rec) < 0) { > auxtrace_snapshot_enabled = 0; >
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