lkml.org 
[lkml]   [2021]   [Oct]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[tip: perf/core] perf: Add mem_hops field in perf_mem_data_src structure
The following commit has been merged into the perf/core branch of tip:

Commit-ID: fec9cc6175d0ec1e13efe12be491d9bd4de62f80
Gitweb: https://git.kernel.org/tip/fec9cc6175d0ec1e13efe12be491d9bd4de62f80
Author: Kajol Jain <kjain@linux.ibm.com>
AuthorDate: Wed, 06 Oct 2021 19:36:52 +05:30
Committer: Peter Zijlstra <peterz@infradead.org>
CommitterDate: Tue, 19 Oct 2021 17:27:00 +02:00

perf: Add mem_hops field in perf_mem_data_src structure

Going forward, future generation systems can have more hierarchy
within the node/package level but currently we don't have any data source
encoding field in perf, which can be used to represent this level of data.

Add a new field called 'mem_hops' in the perf_mem_data_src structure
which can be used to represent intra-node/package or inter-node/off-package
details. This field is of size 3 bits where PERF_MEM_HOPS_{NA, 0..6} value
can be used to present different hop levels data.

Also add corresponding macros to define mem_hop field values
and shift value.

Currently we define macro for HOPS_0 which corresponds
to data coming from another core but same node.

For ex: Encodings for mem_hops fields with L2 cache:

L2 - local L2
L2 | REMOTE | HOPS_0 - remote core, same node L2

Signed-off-by: Kajol Jain <kjain@linux.ibm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20211006140654.298352-3-kjain@linux.ibm.com
---
include/uapi/linux/perf_event.h | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
index a74538c..bd8860e 100644
--- a/include/uapi/linux/perf_event.h
+++ b/include/uapi/linux/perf_event.h
@@ -1225,14 +1225,16 @@ union perf_mem_data_src {
mem_remote:1, /* remote */
mem_snoopx:2, /* snoop mode, ext */
mem_blk:3, /* access blocked */
- mem_rsvd:21;
+ mem_hops:3, /* hop level */
+ mem_rsvd:18;
};
};
#elif defined(__BIG_ENDIAN_BITFIELD)
union perf_mem_data_src {
__u64 val;
struct {
- __u64 mem_rsvd:21,
+ __u64 mem_rsvd:18,
+ mem_hops:3, /* hop level */
mem_blk:3, /* access blocked */
mem_snoopx:2, /* snoop mode, ext */
mem_remote:1, /* remote */
@@ -1328,6 +1330,11 @@ union perf_mem_data_src {
#define PERF_MEM_BLK_ADDR 0x04 /* address conflict */
#define PERF_MEM_BLK_SHIFT 40

+/* hop level */
+#define PERF_MEM_HOPS_0 0x01 /* remote core, same node */
+/* 2-7 available */
+#define PERF_MEM_HOPS_SHIFT 43
+
#define PERF_MEM_S(a, s) \
(((__u64)PERF_MEM_##a##_##s) << PERF_MEM_##a##_SHIFT)

\
 
 \ /
  Last update: 2021-10-19 17:36    [W:0.076 / U:0.424 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site