Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 37548914 authored by Anshuman Khandual's avatar Anshuman Khandual Committed by Ingo Molnar
Browse files

perf/x86: Add conditional branch filtering support 



This patch adds conditional branch filtering support,
enabling it for PERF_SAMPLE_BRANCH_COND in perf branch
stack sampling framework by utilizing an available
software filter X86_BR_JCC.

Signed-off-by: default avatarAnshuman Khandual <khandual@linux.vnet.ibm.com>
Reviewed-by: default avatarStephane Eranian <eranian@google.com>
Reviewed-by: default avatarAndi Kleen <ak@linux.intel.com>
Signed-off-by: default avatarPeter Zijlstra <peterz@infradead.org>
Cc: mpe@ellerman.id.au
Cc: benh@kernel.crashing.org
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/1400743210-32289-3-git-send-email-khandual@linux.vnet.ibm.com


Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent 0fffa5df

arch/x86/kernel/cpu/perf_event_intel_lbr.c

+5 −0
Original line number Diff line number Diff line
@@ -384,6 +384,9 @@ static void intel_pmu_setup_sw_lbr_filter(struct perf_event *event) 
	if (br_type & PERF_SAMPLE_BRANCH_NO_TX)

		mask |= X86_BR_NO_TX;



	if (br_type & PERF_SAMPLE_BRANCH_COND)

		mask |= X86_BR_JCC;



	/*

	 * stash actual user request into reg, it may

	 * be used by fixup code for some CPU
@@ -678,6 +681,7 @@ static const int nhm_lbr_sel_map[PERF_SAMPLE_BRANCH_MAX] = { 
	 * NHM/WSM erratum: must include IND_JMP to capture IND_CALL

	 */

	[PERF_SAMPLE_BRANCH_IND_CALL] = LBR_IND_CALL | LBR_IND_JMP,

	[PERF_SAMPLE_BRANCH_COND]     = LBR_JCC,

};



static const int snb_lbr_sel_map[PERF_SAMPLE_BRANCH_MAX] = {
@@ -689,6 +693,7 @@ static const int snb_lbr_sel_map[PERF_SAMPLE_BRANCH_MAX] = { 
	[PERF_SAMPLE_BRANCH_ANY_CALL]	= LBR_REL_CALL | LBR_IND_CALL

					| LBR_FAR,

	[PERF_SAMPLE_BRANCH_IND_CALL]	= LBR_IND_CALL,

	[PERF_SAMPLE_BRANCH_COND]       = LBR_JCC,

};



/* core */