cachepc

commit cb7c6b3d6767335d13892451c141cfb717807712
parent 5975ec7b44887ad54417218251e669cca14bde80
Author: Louis Burda <quent.burda@gmail.com>
Date:   Wed, 25 Jan 2023 20:21:40 +0100

Use mfence instead of lfence for memory barrier

Diffstat:
M
Makefile
 | 
2
+-
M
cachepc/cachepc.c
 | 
4
+++-
M
cachepc/macro.S
 | 
4
++--
M
cachepc/uapi.h
 | 
1
+

4 files changed, 7 insertions(+), 4 deletions(-)
diff --git a/Makefile b/Makefile
@@ -57,7 +57,7 @@ load:
 prep:
 	sudo sh -c "echo 0 > /proc/sys/kernel/watchdog"
 	sudo cpupower frequency-set -d 3.7GHz -u 3.7GHz
-	sudo sh -c "echo 1 > /proc/irq/127/smp_affinity"
+	sudo bash -c "for f in /proc/irq/*/smp_affinity; do echo 1 > \$$f 2>/dev/null; done"
 
 util/%: util/%.c $(CACHEPC_UAPI)
 
diff --git a/cachepc/cachepc.c b/cachepc/cachepc.c
@@ -161,7 +161,9 @@ cachepc_save_msrmts(struct cacheline *head)
 	do {
 		if (cl->first) {
 			BUG_ON(cl->cache_set >= L1_SETS);
-			WARN_ON(cl->count > L1_ASSOC);
+			if (cl->count > L1_ASSOC)
+				CPC_ERR("Read count %llu for set %u line %u",
+					cl->count, cl->cache_set, cl->cache_line);
 			cachepc_msrmts[cl->cache_set] = cl->count;
 		} else {
 			BUG_ON(cl->count != 0);
diff --git a/cachepc/macro.S b/cachepc/macro.S
@@ -2,8 +2,8 @@
 
 # clobbers rax, rbx, rcx, rdx
 .macro barrier
-    lfence # memory barrier
-    rdtsc # compiler barrier
+    mfence # memory barrier
+    rdtsc # serializing
 .endm
 
 # clobbers rax, rbx, rcx, rdx, (out)
diff --git a/cachepc/uapi.h b/cachepc/uapi.h
@@ -55,6 +55,7 @@ enum {
 	CPC_TRACK_FAULT_NO_RUN,
 	CPC_TRACK_EXEC,
 	CPC_TRACK_FULL,
+	CPC_TRACK_AUTO_FULL,
 };
 
 struct cpc_track_config {