Messages in this thread |  | | From | David Ahern <> | Subject | [PATCH 0/4] perf trace fixes | Date | Wed, 4 Dec 2013 19:41:38 -0700 |
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Hi Arnaldo:
As I mentioned on IRC perf-trace fails on older kernels -- like RHEL6. This set of patches makes it at least usable - though still some problems I am hoping you can fix.
Build perf with these patches and run:
perf trace -- dd if=/dev/zero of=/tmp/zero bs=4096 count=16
you see something like this which is just wrong:
3.684 ( 0.007 ms): write(buf: 2, count: 140737077958816 ) = 27
there is no fd (should be 1 for the write) and all the values are wrong. Perhaps it is an artifact of the older way of doing system call tracing, but I see something goofy with the 3.12 kernel as well: 5.633 ( 0.004 ms): write(fd: 2, buf: 0x7fff9177fee0, count: 24 ) = 24
According to strace that should be a return of 4096.
David Ahern (4): perf trace: Add support for syscalls vs raw_syscalls perf trace: Fix crash on RHEL6 perf trace: Fix summary percentage when processing files perf trace: Add option to specify machine type
tools/perf/builtin-trace.c | 48 ++++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 44 insertions(+), 4 deletions(-)
-- 1.8.3.4 (Apple Git-47)
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