This patch set is to refine metrics output organization.
If we reivew the current memory metrics in Perf c2c tool, it doesn't
orgnize the metrics with directive approach; thus user needs to take
time to dig into every statistics item. On the other hand, if use the
"summary and breakdown" approach, the output result will be easier for
reviewing by users, e.g. the output result can firstly give out the
summary values, and then the later items will breakdown into more
detailed statistics.
For this reason, this patch is to reorgnize the metrics and it only
changes for the "Shared Data Cache Line Table": it firstly displays the
summary values for total records, total loads, total stores; then it
breaks these summary values into small values, with the order from the
most near memory node ("CPU Load Hit") to more far nodes
("LLC Load Hit", "RMT Load Hit", "Load Dram").
"LLC Load Hit" = "LclHit" + "LclHitm"
"RMT Load Hit" = "RmtHit" + "RmtHitm" \
-> LLC Load Miss
"Load Dram" = "Lcl" + "Rmt" /
Another main reason for this patch set is wanting to extend "perf c2c"
to support Arm SPE memory event, but Arm SPE doesn't contain 'HTIM' tag
in its default trace data, for this case if want to analyze cache false
sharing issue, we need to rely on LLC metrics + multi-threading info.
So this patch set can be friendly to show LLC related metrics in the
"Shared Data Cache Line Table"; for sorting cache lines with LLC metrics
which will be sent out with another separate patch set.
Before:
=================================================
Shared Data Cache Line Table
=================================================
#
# ----------- Cacheline ---------- Total Tot ----- LLC Load
Hitm ----- ---- Store Reference ---- --- Load Dram ---- LLC Total
----- Core Load Hit ----- -- LLC Load Hit --
# Index Address Node PA cnt records Hitm Total Lcl
Rmt Total L1Hit L1Miss Lcl Rmt Ld Miss Loads
FB L1 L2 Llc Rmt
# ..... .................. .... ...... ....... ....... ....... .......
....... ....... ....... ....... ........ ........ ....... .......
....... ....... ....... ........ ........
#
0 0x55acdcc92100 0 8197 40716 52.18% 3170 3170
0 24466 24437 29 0 0 0 16250
3349 5909 0 3822 0
1 0x55acdcc920c0 0 1 4621 31.01% 1884 1884
0 0 0 0 0 0 0 4621
739 0 0 1998 0
2 0x55acdcc92080 0 1 4475 16.69% 1014 1014
0 0 0 0 0 0 0 4475
2405 0 0 1056 0
After:
=================================================
Shared Data Cache Line Table
=================================================
#
# ----------- Cacheline ---------- Tot ------- Load Hitm -------
Total Total Total ---- Stores ---- ----- Core Load Hit ----- - LLC
Load Hit -- - RMT Load Hit -- --- Load Dram ----
# Index Address Node PA cnt Hitm Total LclHitm RmtHitm
records Loads Stores L1Hit L1Miss FB L1 L2
LclHit LclHitm RmtHit RmtHitm Lcl Rmt
# ..... .................. .... ...... ....... ....... ....... .......
....... ....... ....... ....... ....... ....... ....... .......
........ ....... ........ ....... ........ ........
#
0 0x55acdcc92100 0 8197 52.18% 3170 3170 0
40716 16250 24466 24437 29 3349 5909 0 3822
3170 0 0 0 0
1 0x55acdcc920c0 0 1 31.01% 1884 1884 0
4621 4621 0 0 0 739 0 0 1998
1884 0 0 0 0
2 0x55acdcc92080 0 1 16.69% 1014 1014 0
4475 4475 0 0 0 2405 0 0 1056
1014 0 0 0 0
Leo Yan (8):
perf c2c: Display the total numbers continuously
perf c2c: Display "Total Stores" as a standalone metrics
perf c2c: Organize metrics based on memory hierarchy
perf c2c: Change header from "LLC Load Hitm" to "Load Hitm"
perf c2c: Use more explicit headers for HITM
perf c2c: Change header for LLC local hit
perf c2c: Correct LLC load hit metrics
perf c2c: Add metrics "RMT Load Hit"
tools/perf/builtin-c2c.c | 83 +++++++++-------------------------------
1 file changed, 18 insertions(+), 65 deletions(-)
--
2.17.1
