linux-kernel - [tip: perf/core] perf: Add comment about current state of PERF_MEM_LVL

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Date:   Tue, 19 Oct 2021 15:35:51 -0000
From:   "tip-bot2 for Kajol Jain" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Kajol Jain <kjain@...ux.ibm.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: perf/core] perf: Add comment about current state of
 PERF_MEM_LVL_* namespace and remove an extra line

The following commit has been merged into the perf/core branch of tip:

Commit-ID:     f4c6217f7f5936f7173d028559ff5d25cce10816
Gitweb:        https://git.kernel.org/tip/f4c6217f7f5936f7173d028559ff5d25cce10816
Author:        Kajol Jain <kjain@...ux.ibm.com>
AuthorDate:    Wed, 06 Oct 2021 19:36:51 +05:30
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Tue, 19 Oct 2021 17:27:00 +02:00

perf: Add comment about current state of PERF_MEM_LVL_* namespace and remove an extra line

Add a comment about PERF_MEM_LVL_* namespace being depricated
to some extent in favour of added PERF_MEM_{LVLNUM_,REMOTE_,SNOOPX_}
fields.

Remove an extra line present in perf_mem__lvl_scnprintf function.

Signed-off-by: Kajol Jain <kjain@...ux.ibm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Link: https://lore.kernel.org/r/20211006140654.298352-2-kjain@linux.ibm.com
---
 include/uapi/linux/perf_event.h       | 8 +++++++-
 tools/include/uapi/linux/perf_event.h | 8 +++++++-
 tools/perf/util/mem-events.c          | 1 -
 3 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
index c89535d..a74538c 100644
--- a/include/uapi/linux/perf_event.h
+++ b/include/uapi/linux/perf_event.h
@@ -1256,7 +1256,13 @@ union perf_mem_data_src {
 #define PERF_MEM_OP_EXEC	0x10 /* code (execution) */
 #define PERF_MEM_OP_SHIFT	0
 
-/* memory hierarchy (memory level, hit or miss) */
+/*
+ * PERF_MEM_LVL_* namespace being depricated to some extent in the
+ * favour of newer composite PERF_MEM_{LVLNUM_,REMOTE_,SNOOPX_} fields.
+ * Supporting this namespace inorder to not break defined ABIs.
+ *
+ * memory hierarchy (memory level, hit or miss)
+ */
 #define PERF_MEM_LVL_NA		0x01  /* not available */
 #define PERF_MEM_LVL_HIT	0x02  /* hit level */
 #define PERF_MEM_LVL_MISS	0x04  /* miss level  */
diff --git a/tools/include/uapi/linux/perf_event.h b/tools/include/uapi/linux/perf_event.h
index f92880a..e1701e9 100644
--- a/tools/include/uapi/linux/perf_event.h
+++ b/tools/include/uapi/linux/perf_event.h
@@ -1241,7 +1241,13 @@ union perf_mem_data_src {
 #define PERF_MEM_OP_EXEC	0x10 /* code (execution) */
 #define PERF_MEM_OP_SHIFT	0
 
-/* memory hierarchy (memory level, hit or miss) */
+/*
+ * PERF_MEM_LVL_* namespace being depricated to some extent in the
+ * favour of newer composite PERF_MEM_{LVLNUM_,REMOTE_,SNOOPX_} fields.
+ * Supporting this namespace inorder to not break defined ABIs.
+ *
+ * memory hierarchy (memory level, hit or miss)
+ */
 #define PERF_MEM_LVL_NA		0x01  /* not available */
 #define PERF_MEM_LVL_HIT	0x02  /* hit level */
 #define PERF_MEM_LVL_MISS	0x04  /* miss level  */
diff --git a/tools/perf/util/mem-events.c b/tools/perf/util/mem-events.c
index f0e75df..ff7289e 100644
--- a/tools/perf/util/mem-events.c
+++ b/tools/perf/util/mem-events.c
@@ -320,7 +320,6 @@ int perf_mem__lvl_scnprintf(char *out, size_t sz, struct mem_info *mem_info)
 	/* already taken care of */
 	m &= ~(PERF_MEM_LVL_HIT|PERF_MEM_LVL_MISS);
 
-
 	if (mem_info && mem_info->data_src.mem_remote) {
 		strcat(out, "Remote ");
 		l += 7;