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virResctrlMonitorGetStats: Don't use 'virStringListAdd'

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The iner loop copies the 'resources' array multiple times using
'virStringListAdd' which has O(n^2) complexity.

Pre-calculate the length so we can allocate the array upfront and just
copy the strings in the loop.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
This commit is contained in:
Peter Krempa 2021-02-05 15:30:02 +01:00
parent 34088ea47f
commit b297714793
1 changed files with 3 additions and 2 deletions
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5
src/util/virresctrl.c
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@ -2662,6 +2662,7 @@ virResctrlMonitorGetStats(virResctrlMonitorPtr monitor,
char *filepath = NULL;
struct dirent *ent = NULL;
virResctrlMonitorStatsPtr stat = NULL;
size_t nresources = g_strv_length((char **) resources);
if (!monitor) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
@ -2705,6 +2706,7 @@ virResctrlMonitorGetStats(virResctrlMonitorPtr monitor,
continue;
stat = g_new0(virResctrlMonitorStats, 1);
stat->features = g_new0(char *, nresources + 1);
/* The node ID number should be here, parsing it. */
if (virStrToLong_uip(node_id, NULL, 0, &stat->id) < 0)
@ -2724,8 +2726,7 @@ virResctrlMonitorGetStats(virResctrlMonitorPtr monitor,
if (VIR_APPEND_ELEMENT(stat->vals, stat->nvals, val) < 0)
goto cleanup;
if (virStringListAdd(&stat->features, resources[i]) < 0)
goto cleanup;
stat->features[i] = g_strdup(resources[i]);
}
if (VIR_APPEND_ELEMENT(*stats, *nstats, stat) < 0)