File verify_blkparse-change-maxecpus-to-deal-with-sy... of Package blktrace.1013

Overview Repositories Revisions Requests Users Attributes Meta

File verify_blkparse-change-maxecpus-to-deal-with-systems-larger-the-512.patch of Package blktrace.1013

From: Nathan Zimmer <nzimmer@sgi.com>
Subject: verify_blkparse: Change maxecpus to deal with systems larger the 512
Git-repo: git://git.kernel.dk/blktrace.git
Git-commit: 28fa9f69a23f70e4371fb483beb2d4881dbd074d
Patch-mainline: blktrace-1.1.0
References: bsc#934392

verify_blkpars has troubles with systems larger then 512.
Also there is issue in the scanning code causing the cpu number to be
truncated to the first two digits. i.e cpu 542 would be read as 54.

Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Nathan Zimmer <nzimmer@sgi.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Acked-by: Jeff Mahoney <jeffm@suse.com>
---
 verify_blkparse.c | 23 +++++++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

diff --git a/verify_blkparse.c b/verify_blkparse.c
index aae8d7c..5689f43 100644
--- a/verify_blkparse.c
+++ b/verify_blkparse.c
@@ -3,18 +3,33 @@
 #include <fcntl.h>
 #include <string.h>
 #include <unistd.h>
-
-#define MAX_CPUS	(512)
+#include <errno.h>
 
 int main(int argc, char *argv[])
 {
 	double this_time, last_time;
 	char line[256], last_line[256], *p;
 	int major, minor, cpu, nr, alias;
+	long  MAX_CPUS;
 	unsigned long long total_entries;
-	unsigned int last_seq[MAX_CPUS], seq;
+	unsigned int *last_seq;
+	unsigned int seq;
 	FILE *f;
 
+#ifdef _SC_NPROCESSORS_CONF
+	MAX_CPUS = sysconf(_SC_NPROCESSORS_CONF);
+	if (MAX_CPUS < 1)
+	{
+		fprintf(stderr, "Could not determine number of CPUs online:\n%s\n", 
+			strerror (errno));
+		fprintf(stderr, "Assuming 1024\n");
+		MAX_CPUS = 1024;
+  	}
+#else
+	MAX_CPUS = CPU_SETSIZE;
+#endif 
+	
+	last_seq = malloc( sizeof(unsigned int) * MAX_CPUS );
 	for (nr = 0; nr < MAX_CPUS; nr++)
 		last_seq[nr] = -1;
 
@@ -33,7 +48,7 @@ int main(int argc, char *argv[])
 	alias = nr = 0;
 	total_entries = 0;
 	while ((p = fgets(line, sizeof(line), f)) != NULL) {
-		if (sscanf(p, "%3d,%3d %2d %8d %lf", &major, &minor, &cpu, &seq, &this_time) != 5)
+		if (sscanf(p, "%3d,%3d %5d %8d %lf", &major, &minor, &cpu, &seq, &this_time) != 5)
 			break;
 
 		if (this_time < last_time) {
-- 
1.7.12.4

Places

File verify_blkparse-change-maxecpus-to-deal-with-systems-larger-the-512.patch of Package blktrace.1013

Places