perf/x86: Fix local vs remote memory events for NHM/WSM
authorPeter Zijlstra <a.p.zijlstra@chello.nl>
Mon, 5 Mar 2012 22:59:25 +0000 (23:59 +0100)
committerIngo Molnar <mingo@elte.hu>
Mon, 12 Mar 2012 19:43:41 +0000 (20:43 +0100)
Verified using the below proglet.. before:

[root@westmere ~]# perf stat -e node-stores -e node-store-misses ./numa 0
remote write

 Performance counter stats for './numa 0':

         2,101,554 node-stores
         2,096,931 node-store-misses

       5.021546079 seconds time elapsed

[root@westmere ~]# perf stat -e node-stores -e node-store-misses ./numa 1
local write

 Performance counter stats for './numa 1':

           501,137 node-stores
               199 node-store-misses

       5.124451068 seconds time elapsed

After:

[root@westmere ~]# perf stat -e node-stores -e node-store-misses ./numa 0
remote write

 Performance counter stats for './numa 0':

         2,107,516 node-stores
         2,097,187 node-store-misses

       5.012755149 seconds time elapsed

[root@westmere ~]# perf stat -e node-stores -e node-store-misses ./numa 1
local write

 Performance counter stats for './numa 1':

         2,063,355 node-stores
               165 node-store-misses

       5.082091494 seconds time elapsed

#define _GNU_SOURCE

#include <sched.h>
#include <stdio.h>
#include <errno.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <dirent.h>
#include <signal.h>
#include <unistd.h>
#include <numaif.h>
#include <stdlib.h>

#define SIZE (32*1024*1024)

volatile int done;

void sig_done(int sig)
{
done = 1;
}

int main(int argc, char **argv)
{
cpu_set_t *mask, *mask2;
size_t size;
int i, err, t;
int nrcpus = 1024;
char *mem;
unsigned long nodemask = 0x01; /* node 0 */
DIR *node;
struct dirent *de;
int read = 0;
int local = 0;

if (argc < 2) {
printf("usage: %s [0-3]\n", argv[0]);
printf("  bit0 - local/remote\n");
printf("  bit1 - read/write\n");
exit(0);
}

switch (atoi(argv[1])) {
case 0:
printf("remote write\n");
break;
case 1:
printf("local write\n");
local = 1;
break;
case 2:
printf("remote read\n");
read = 1;
break;
case 3:
printf("local read\n");
local = 1;
read = 1;
break;
}

mask = CPU_ALLOC(nrcpus);
size = CPU_ALLOC_SIZE(nrcpus);
CPU_ZERO_S(size, mask);

node = opendir("/sys/devices/system/node/node0/");
if (!node)
perror("opendir");
while ((de = readdir(node))) {
int cpu;

if (sscanf(de->d_name, "cpu%d", &cpu) == 1)
CPU_SET_S(cpu, size, mask);
}
closedir(node);

mask2 = CPU_ALLOC(nrcpus);
CPU_ZERO_S(size, mask2);
for (i = 0; i < size; i++)
CPU_SET_S(i, size, mask2);
CPU_XOR_S(size, mask2, mask2, mask); // invert

if (!local)
mask = mask2;

err = sched_setaffinity(0, size, mask);
if (err)
perror("sched_setaffinity");

mem = mmap(0, SIZE, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
err = mbind(mem, SIZE, MPOL_BIND, &nodemask, 8*sizeof(nodemask), MPOL_MF_MOVE);
if (err)
perror("mbind");

signal(SIGALRM, sig_done);
alarm(5);

if (!read) {
while (!done) {
for (i = 0; i < SIZE; i++)
mem[i] = 0x01;
}
} else {
while (!done) {
for (i = 0; i < SIZE; i++)
t += *(volatile char *)(mem + i);
}
}

return 0;
}

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Cc: <stable@kernel.org>
Link: http://lkml.kernel.org/n/tip-tq73sxus35xmqpojf7ootxgs@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@elte.hu>
arch/x86/kernel/cpu/perf_event_intel.c

index 3bd37bd..61d4f79 100644 (file)
@@ -385,14 +385,15 @@ static __initconst const u64 westmere_hw_cache_event_ids
 #define NHM_LOCAL_DRAM         (1 << 14)
 #define NHM_NON_DRAM           (1 << 15)
 
-#define NHM_ALL_DRAM           (NHM_REMOTE_DRAM|NHM_LOCAL_DRAM)
+#define NHM_LOCAL              (NHM_LOCAL_DRAM|NHM_REMOTE_CACHE_FWD)
+#define NHM_REMOTE             (NHM_REMOTE_DRAM)
 
 #define NHM_DMND_READ          (NHM_DMND_DATA_RD)
 #define NHM_DMND_WRITE         (NHM_DMND_RFO|NHM_DMND_WB)
 #define NHM_DMND_PREFETCH      (NHM_PF_DATA_RD|NHM_PF_DATA_RFO)
 
 #define NHM_L3_HIT     (NHM_UNCORE_HIT|NHM_OTHER_CORE_HIT_SNP|NHM_OTHER_CORE_HITM)
-#define NHM_L3_MISS    (NHM_NON_DRAM|NHM_ALL_DRAM|NHM_REMOTE_CACHE_FWD)
+#define NHM_L3_MISS    (NHM_NON_DRAM|NHM_LOCAL_DRAM|NHM_REMOTE_DRAM|NHM_REMOTE_CACHE_FWD)
 #define NHM_L3_ACCESS  (NHM_L3_HIT|NHM_L3_MISS)
 
 static __initconst const u64 nehalem_hw_cache_extra_regs
@@ -416,16 +417,16 @@ static __initconst const u64 nehalem_hw_cache_extra_regs
  },
  [ C(NODE) ] = {
        [ C(OP_READ) ] = {
-               [ C(RESULT_ACCESS) ] = NHM_DMND_READ|NHM_ALL_DRAM,
-               [ C(RESULT_MISS)   ] = NHM_DMND_READ|NHM_REMOTE_DRAM,
+               [ C(RESULT_ACCESS) ] = NHM_DMND_READ|NHM_LOCAL|NHM_REMOTE,
+               [ C(RESULT_MISS)   ] = NHM_DMND_READ|NHM_REMOTE,
        },
        [ C(OP_WRITE) ] = {
-               [ C(RESULT_ACCESS) ] = NHM_DMND_WRITE|NHM_ALL_DRAM,
-               [ C(RESULT_MISS)   ] = NHM_DMND_WRITE|NHM_REMOTE_DRAM,
+               [ C(RESULT_ACCESS) ] = NHM_DMND_WRITE|NHM_LOCAL|NHM_REMOTE,
+               [ C(RESULT_MISS)   ] = NHM_DMND_WRITE|NHM_REMOTE,
        },
        [ C(OP_PREFETCH) ] = {
-               [ C(RESULT_ACCESS) ] = NHM_DMND_PREFETCH|NHM_ALL_DRAM,
-               [ C(RESULT_MISS)   ] = NHM_DMND_PREFETCH|NHM_REMOTE_DRAM,
+               [ C(RESULT_ACCESS) ] = NHM_DMND_PREFETCH|NHM_LOCAL|NHM_REMOTE,
+               [ C(RESULT_MISS)   ] = NHM_DMND_PREFETCH|NHM_REMOTE,
        },
  },
 };