perf c2c: Update documentation for new display option 'peer'

Since the new display option 'peer' is introduced, this patch is to
update the documentation to reflect it.

Reviewed-by: Ali Saidi <alisaidi@amazon.com>
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: German Gomez <german.gomez@arm.com>
Cc: Gustavo A. R. Silva <gustavoars@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.garry@huawei.com>
Cc: Kajol Jain <kjain@linux.ibm.com>
Cc: Like Xu <likexu@tencent.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Timothy Hayes <timothy.hayes@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org
Link: https://lore.kernel.org/r/20220811062451.435810-16-leo.yan@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 24 insertions, 7 deletions

diff --git a/tools/perf/Documentation/perf-c2c.txt b/tools/perf/Documentation/perf-c2c.txt
index 6f69173731aa66..f1f7ae6b08d1e3 100644
--- a/tools/perf/Documentation/perf-c2c.txt
+++ b/tools/perf/Documentation/perf-c2c.txt
@@ -109,7 +109,9 @@ REPORT OPTIONS
 
 -d::
 --display::
-	Switch to HITM type (rmt, lcl) to display and sort on. Total HITMs as default.
+	Switch to HITM type (rmt, lcl) or peer snooping type (peer) to display
+	and sort on. Total HITMs (tot) as default, except Arm64 uses peer mode
+	as default.
 
 --stitch-lbr::
 	Show callgraph with stitched LBRs, which may have more complete
@@ -174,12 +176,18 @@ For each cacheline in the 1) list we display following data:
   Cacheline
   - cacheline address (hex number)
 
-  Rmt/Lcl Hitm
+  Rmt/Lcl Hitm (Display with HITM types)
   - cacheline percentage of all Remote/Local HITM accesses
 
-  LLC Load Hitm - Total, LclHitm, RmtHitm
+  Peer Snoop (Display with peer type)
+  - cacheline percentage of all peer accesses
+
+  LLC Load Hitm - Total, LclHitm, RmtHitm (For display with HITM types)
   - count of Total/Local/Remote load HITMs
 
+  Load Peer - Total, Local, Remote (For display with peer type)
+  - count of Total/Local/Remote load from peer cache or DRAM
+
   Total records
   - sum of all cachelines accesses
 
@@ -201,16 +209,21 @@ For each cacheline in the 1) list we display following data:
   - count of LLC load accesses, includes LLC hits and LLC HITMs
 
   RMT Load Hit - RmtHit, RmtHitm
-  - count of remote load accesses, includes remote hits and remote HITMs
+  - count of remote load accesses, includes remote hits and remote HITMs;
+    on Arm neoverse cores, RmtHit is used to account remote accesses,
+    includes remote DRAM or any upward cache level in remote node
 
   Load Dram - Lcl, Rmt
   - count of local and remote DRAM accesses
 
 For each offset in the 2) list we display following data:
 
-  HITM - Rmt, Lcl
+  HITM - Rmt, Lcl (Display with HITM types)
   - % of Remote/Local HITM accesses for given offset within cacheline
 
+  Peer Snoop - Rmt, Lcl (Display with peer type)
+  - % of Remote/Local peer accesses for given offset within cacheline
+
   Store Refs - L1 Hit, L1 Miss, N/A
   - % of store accesses that hit L1, missed L1 and N/A (no available) memory
     level for given offset within cacheline
@@ -227,9 +240,12 @@ For each offset in the 2) list we display following data:
   Code address
   - code address responsible for the accesses
 
-  cycles - rmt hitm, lcl hitm, load
+  cycles - rmt hitm, lcl hitm, load (Display with HITM types)
     - sum of cycles for given accesses - Remote/Local HITM and generic load
 
+  cycles - rmt peer, lcl peer, load (Display with peer type)
+    - sum of cycles for given accesses - Remote/Local peer load and generic load
+
   cpu cnt
     - number of cpus that participated on the access
 
@@ -251,7 +267,8 @@ The 'Node' field displays nodes that accesses given cacheline
 offset. Its output comes in 3 flavors:
   - node IDs separated by ','
   - node IDs with stats for each ID, in following format:
-      Node{cpus %hitms %stores}
+      Node{cpus %hitms %stores} (Display with HITM types)
+      Node{cpus %peers %stores} (Display with peer type)
   - node IDs with list of affected CPUs in following format:
       Node{cpu list}