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nodeinfo: Use a bitmap to keep track of node CPUs

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Keep track of what CPUs belong to the current node while walking
through the sysfs node entry, so we don't need to do it a second
time immediately afterwards.

This also allows us to loop through all CPUs that are part of a
node in guaranteed ascending order, which is something that is
required for some upcoming changes.
This commit is contained in:
Andrea Bolognani 2015-07-20 18:37:29 +02:00 committed by Peter Krempa
parent b909e9fb2c
commit 05be606282
1 changed files with 17 additions and 9 deletions
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26
src/nodeinfo.c
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@ -411,8 +411,10 @@ virNodeParseNode(const char *sysfs_prefix,
struct dirent *cpudirent = NULL;
virBitmapPtr present_cpumap = NULL;
virBitmapPtr online_cpus_map = NULL;
virBitmapPtr node_cpus_map = NULL;
virBitmapPtr sockets_map = NULL;
virBitmapPtr *cores_maps = NULL;
int npresent_cpus;
int sock_max = 0;
int sock;
int core;
@ -437,6 +439,12 @@ virNodeParseNode(const char *sysfs_prefix,
if (!online_cpus_map)
goto cleanup;
npresent_cpus = virBitmapSize(present_cpumap);
/* Keep track of the CPUs that belong to the current node */
if (!(node_cpus_map = virBitmapNew(npresent_cpus)))
goto cleanup;
/* enumerate sockets in the node */
if (!(sockets_map = virBitmapNew(ID_MAX + 1)))
goto cleanup;
@ -448,6 +456,10 @@ virNodeParseNode(const char *sysfs_prefix,
if (!virBitmapIsBitSet(present_cpumap, cpu))
continue;
/* Mark this CPU as part of the current node */
if (virBitmapSetBit(node_cpus_map, cpu) < 0)
goto cleanup;
if (!virBitmapIsBitSet(online_cpus_map, cpu))
continue;
@ -481,13 +493,11 @@ virNodeParseNode(const char *sysfs_prefix,
if (!(cores_maps[i] = virBitmapNew(ID_MAX + 1)))
goto cleanup;
/* iterate over all CPU's in the node */
rewinddir(cpudir);
while ((direrr = virDirRead(cpudir, &cpudirent, node)) > 0) {
if (sscanf(cpudirent->d_name, "cpu%u", &cpu) != 1)
continue;
/* Iterate over all CPUs in the node, in ascending order */
for (cpu = 0; cpu < npresent_cpus; cpu++) {
if (!virBitmapIsBitSet(present_cpumap, cpu))
/* Skip CPUs that are not part of the current node */
if (!virBitmapIsBitSet(node_cpus_map, cpu))
continue;
if (!virBitmapIsBitSet(online_cpus_map, cpu)) {
@ -530,9 +540,6 @@ virNodeParseNode(const char *sysfs_prefix,
*threads = siblings;
}
if (direrr < 0)
goto cleanup;
/* finalize the returned data */
*sockets = virBitmapCountBits(sockets_map);
@ -558,6 +565,7 @@ virNodeParseNode(const char *sysfs_prefix,
virBitmapFree(cores_maps[i]);
VIR_FREE(cores_maps);
virBitmapFree(sockets_map);
virBitmapFree(node_cpus_map);
virBitmapFree(online_cpus_map);
virBitmapFree(present_cpumap);