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linuxNodeGetCPUStats: Correctly handle cpu prefix

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To retrieve node cpu statistics on Linux system, the
linuxNodeGetCPUstats function simply uses STRPREFIX() to match the cpuid
with the one read from /proc/stat. However, as the file is read line by
line it may happen, that some CPUs share the same prefix. So if user
requested stats for the first CPU, which is offline, then there's no
cpu1 in the stats file so the one that we match is cpu10. Which is
obviously wrong. Fortunately, the IDs are terminated by a space, so we
can utilize that.

Signed-off-by: Bing Bu Cao <mars@linux.vnet.ibm.com>
This commit is contained in:
Bing Bu Cao 2014-01-16 16:18:09 +08:00 committed by Michal Privoznik
parent 9d6f26e57c
commit 94f8205359
1 changed files with 2 additions and 2 deletions
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4
src/nodeinfo.c
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@ -708,9 +708,9 @@ linuxNodeGetCPUStats(FILE *procstat,
}
if (cpuNum == VIR_NODE_CPU_STATS_ALL_CPUS) {
strcpy(cpu_header, "cpu");
strcpy(cpu_header, "cpu ");
} else {
snprintf(cpu_header, sizeof(cpu_header), "cpu%d", cpuNum);
snprintf(cpu_header, sizeof(cpu_header), "cpu%d ", cpuNum);
}
while (fgets(line, sizeof(line), procstat) != NULL) {