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nodeinfo: port nodecpumap to RHEL5

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Prior to this patch, 'virsh nodecpumap' on older kernels reported:
error: Unable to get cpu map
error: out of memory

* src/nodeinfo.c (linuxParseCPUmax): Don't overwrite error.
(nodeGetCPUBitmap): Provide backup implementation.
This commit is contained in:
Eric Blake 2012-11-15 07:04:33 -07:00
parent 47976b484c
commit 9504ae5b67
1 changed files with 23 additions and 10 deletions
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33
src/nodeinfo.c
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@ -792,10 +792,8 @@ linuxParseCPUmax(const char *path)
char *tmp;
int ret = -1;
if (virFileReadAll(path, 5 * VIR_DOMAIN_CPUMASK_LEN, &str) < 0) {
virReportOOMError();
if (virFileReadAll(path, 5 * VIR_DOMAIN_CPUMASK_LEN, &str) < 0)
goto cleanup;
}
tmp = str;
do {
@ -1024,15 +1022,30 @@ nodeGetCPUBitmap(int *max_id ATTRIBUTE_UNUSED)
virBitmapPtr cpumap;
int present;
present = linuxParseCPUmax(SYSFS_SYSTEM_PATH "/cpu/present");
/* XXX should we also work on older kernels, like RHEL5, that lack
* cpu/present and cpu/online files? Those kernels also lack cpu
* hotplugging, so it would be a matter of finding the largest
* cpu/cpuNN directory, and creating a map that size with all bits
* set. */
present = nodeGetCPUCount();
if (present < 0)
return NULL;
cpumap = linuxParseCPUmap(present, SYSFS_SYSTEM_PATH "/cpu/online");
if (virFileExists(SYSFS_SYSTEM_PATH "/cpu/online")) {
cpumap = linuxParseCPUmap(present, SYSFS_SYSTEM_PATH "/cpu/online");
} else {
int i;
cpumap = virBitmapNew(present);
if (!cpumap) {
virReportOOMError();
return NULL;
}
for (i = 0; i < present; i++) {
int online = virNodeGetCpuValue(SYSFS_SYSTEM_PATH, i, "online", 1);
if (online < 0) {
virBitmapFree(cpumap);
return NULL;
}
if (online)
ignore_value(virBitmapSetBit(cpumap, i));
}
}
if (max_id && cpumap)
*max_id = present;
return cpumap;