https://github.com/torvalds/linux
Revision 687805e4a60fe83a11556c041840161f8016a367 authored by Kan Liang on 27 March 2015, 14:38:25 UTC, committed by Ingo Molnar on 02 April 2015, 15:07:42 UTC
For supporting Intel LBR branches filtering, Intel LBR sharing logic
mechanism is introduced from commit b36817e88630 ("perf/x86: Add Intel
LBR sharing logic"). It modifies __intel_shared_reg_get_constraints() to
config lbr_sel, which is finally used to set LBR_SELECT.
However, the intel_shared_regs_constraints() function is called after
intel_pebs_constraints(). The PEBS event will return immediately after
intel_pebs_constraints(). So it's impossible to filter branches for PEBS
events.
This patch moves intel_shared_regs_constraints() ahead of
intel_pebs_constraints().
We can safely do that because the intel_shared_regs_constraints() function
only returns empty constraint if its rejecting the event, otherwise it
returns NULL such that we continue calling intel_pebs_constraints() and
x86_get_event_constraint().
Signed-off-by: Kan Liang <kan.liang@intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: eranian@google.com
Link: http://lkml.kernel.org/r/1427467105-9260-1-git-send-email-kan.liang@intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
1 parent e42391c
Tip revision: 687805e4a60fe83a11556c041840161f8016a367 authored by Kan Liang on 27 March 2015, 14:38:25 UTC
perf/x86/intel: Filter branches for PEBS event
perf/x86/intel: Filter branches for PEBS event
Tip revision: 687805e
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| COPYING | -rw-r--r-- | 18.3 KB |
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| Kconfig | -rw-r--r-- | 252 bytes |
| MAINTAINERS | -rw-r--r-- | 298.9 KB |
| Makefile | -rw-r--r-- | 53.3 KB |
| README | -rw-r--r-- | 18.3 KB |
| REPORTING-BUGS | -rw-r--r-- | 7.3 KB |
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