[PATCH 4/5] perf tools: Add breakpoint address mask syntax to perf list and documentation

[Jacob Shin]

From: Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>


Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>
Signed-off-by: Jacob Shin <jacob.shin@xxxxxxx>
---
 tools/perf/Documentation/perf-record.txt |   14 ++++++++++----
 tools/perf/util/parse-events.c           |    2 +-
 2 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt
index d4da111..48a7587 100644
--- a/tools/perf/Documentation/perf-record.txt
+++ b/tools/perf/Documentation/perf-record.txt
@@ -33,13 +33,19 @@ OPTIONS
         - a raw PMU event (eventsel+umask) in the form of rNNN where NNN is a
 	  hexadecimal event descriptor.
 
-        - a hardware breakpoint event in the form of '\mem:addr[:access]'
-          where addr is the address in memory you want to break in.
-          Access is the memory access type (read, write, execute) it can
-          be passed as follows: '\mem:addr[:[r][w][x]]'.
+        - a hardware breakpoint event in the form of
+          '\mem:addr[:access][:addr_mask]' where addr is the address in
+          memory you want to break in. Access is the memory access type (read,
+          write, execute) it can be passed as follows: '\mem:addr[:[r][w][x]]'.
+          addr_mask is the "don't care" bit mask to further qualify the given
+          addr, to break in on accesses to an address range.
+
           If you want to profile read-write accesses in 0x1000, just set
           'mem:0x1000:rw'.
 
+          If you want to profile write accesses in [0x1000 ~ 0x1010), just set
+          'mem:0x1000:w:0xf'. (Only supported on some hardware)
+
 --filter=<filter>::
         Event filter.
 
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 0744895..93d0c9c 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -1148,7 +1148,7 @@ void print_events(const char *event_glob, bool name_only)
 		printf("\n");
 
 		printf("  %-50s [%s]\n",
-		       "mem:<addr>[:access]",
+		       "mem:<addr>[:access][:addr_mask]",
 			event_type_descriptors[PERF_TYPE_BREAKPOINT]);
 		printf("\n");
 	}
-- 
1.7.9.5


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