linux/tools
Andrew Lutomirski 6c6804fb2c perf symbols: Fix vsyscall symbol lookup
Perf can't currently trace into the vsyscall page.  It looks like it was
meant to work.

Tested on 2.6.38 and today's -git.

The bug is easy to reproduce.  Compile this:

int main()
{
	int i;
	struct timespec t;
	for(i = 0; i < 10000000; i++)
		clock_gettime(CLOCK_MONOTONIC, &t);
	return 0;
}

and run it through perf record; perf report.  The top entry shows
"[unknown]" and you can't zoom in.

It looks like there are two issues.  The first is a that a test for user
mode executing in kernel space is backwards.  (That's the first hunk
below).  The second (I think) is that something's wrong with the code
that generates lots of little struct dso objects for different sections
-- when it runs on vmlinux it results in bogus long_name values which
cause objdump to fail.

Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
LPU-Reference: <AANLkTikxSw5+wJZUWNz++nL7mgivCh_Zf=2Kq6=f9Ce_@mail.gmail.com>
Signed-off-by: Andy Lutomirski <luto@mit.edu>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2011-03-28 14:44:15 -03:00
..
firewire tools/firewire: nosy-dump: increment program version 2010-07-27 11:04:12 +02:00
perf perf symbols: Fix vsyscall symbol lookup 2011-03-28 14:44:15 -03:00
power/x86 tools: turbostat: style updates 2011-02-10 23:58:13 -05:00
slub slub: move slabinfo.c to tools/slub/slabinfo.c 2010-11-06 09:04:32 +02:00
testing/ktest Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-2.6-ktest 2011-03-21 14:13:48 -07:00
usb USB: ffs-test: fix header path 2011-02-28 19:27:12 -08:00
virtio tools/virtio: virtio_test tool 2010-12-09 16:00:22 +02:00