Commit fec9cc61 authored by Kajol Jain's avatar Kajol Jain Committed by Peter Zijlstra
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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: default avatarKajol Jain <kjain@linux.ibm.com>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20211006140654.298352-3-kjain@linux.ibm.com
parent f4c6217f

include/uapi/linux/perf_event.h

+9 −2
Original line number Diff line number Diff line
@@ -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)