[PATCH 2/6] hw_breakpoints: Migrate breakpoint conditional build under new config
prasad at linux.vnet.ibm.com
Tue Jul 5 03:44:16 EST 2011
On Mon, Jul 04, 2011 at 03:29:14PM +0200, Frederic Weisbecker wrote:
> On Mon, Jul 04, 2011 at 06:57:46PM +0530, K.Prasad wrote:
> > On Tue, May 24, 2011 at 11:52:23PM +0200, Frederic Weisbecker wrote:
> > > Migrate conditional hw_breakpoint code compilation under
> > > the new config to prepare for letting the user chose whether
> > > or not to build this feature
> > >
> > Making the hardware breakpoint patches modular has always been a goal.
> > I've looked at the PowerPC parts of the code and they look harmless.
> > Acked-by: K.Prasad <prasad at linux.vnet.ibm.com>
> I'll push that soon, thanks guys for your acks!
Meanwhile, I was testing hardware breakpoints through perf and found
that monitoring a given address fails when using 'perf record' (returns
-ENOSPC) while 'perf stat' and watchpoint through gdb works fine (see
Has this behaviour been reported for other perf counters?
# tools/perf/perf --version
perf version 3.0.0-rc5
# grep pid_max /proc/kallsyms
ffffffff81a25010 D pid_max
ffffffff81a25014 D pid_max_min
ffffffff81a25018 D pid_max_max
# uname -a
Linux llm37.in.ibm.com 3.0.0-rc5 #1 SMP Mon Jul 4 22:24:02 IST 2011
x86_64 x86_64 x86_64 GNU/Linux
# tools/perf/perf stat -e mem:0xffffffff81a25010:rw make kernel/futex.o
make: `kernel/futex.o' is up to date.
Performance counter stats for 'make kernel/futex.o':
10.734957333 seconds time elapsed
# tools/perf/perf record -e
mem:0xffffffff81a25010:rw make kernel/futex.o
Error: sys_perf_event_open() syscall returned with 28 (No space left
on device). /bin/dmesg may provide additional information.
Fatal: No CONFIG_PERF_EVENTS=y kernel support configured?
More information about the Linuxppc-dev