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virnuma: Introduce virNumaSetPagePoolSize
This internal API can be used to allocate or free some pages in the huge pages pool. Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
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@ -1719,6 +1719,7 @@ virNumaGetPageInfo;
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virNumaGetPages;
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virNumaIsAvailable;
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virNumaNodeIsAvailable;
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virNumaSetPagePoolSize;
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virNumaSetupMemoryPolicy;
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@ -841,6 +841,102 @@ virNumaGetPages(int node,
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}
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int
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virNumaSetPagePoolSize(int node,
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unsigned int page_size,
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unsigned long long page_count,
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bool add)
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{
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int ret = -1;
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char *nr_path = NULL, *nr_buf = NULL;
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char *end;
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unsigned long long nr_count;
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if (page_size == sysconf(_SC_PAGESIZE) / 1024) {
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/* Special case as kernel handles system pages
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* differently to huge pages. */
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virReportError(VIR_ERR_OPERATION_UNSUPPORTED, "%s",
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_("system pages pool can't be modified"));
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goto cleanup;
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}
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if (virNumaGetHugePageInfoPath(&nr_path, node, page_size, "nr_hugepages") < 0)
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goto cleanup;
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/* Firstly check, if there's anything for us to do */
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if (virFileReadAll(nr_path, 1024, &nr_buf) < 0)
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goto cleanup;
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if (virStrToLong_ull(nr_buf, &end, 10, &nr_count) < 0 ||
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*end != '\n') {
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virReportError(VIR_ERR_OPERATION_FAILED,
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_("invalid number '%s' in '%s'"),
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nr_buf, nr_path);
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goto cleanup;
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}
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if (add) {
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if (!page_count) {
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VIR_DEBUG("Nothing left to do: add = true page_count = 0");
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ret = 0;
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goto cleanup;
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}
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page_count += nr_count;
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} else {
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if (nr_count == page_count) {
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VIR_DEBUG("Nothing left to do: nr_count = page_count = %llu",
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page_count);
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ret = 0;
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goto cleanup;
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}
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}
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/* Okay, page pool adjustment must be done in two steps. In
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* first we write the desired number into nr_hugepages file.
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* Kernel then starts to allocate the pages (return from
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* write should be postponed until the kernel is finished).
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* However, kernel may have not been successful and reserved
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* all the pages we wanted. So do the second read to check.
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*/
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VIR_FREE(nr_buf);
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if (virAsprintf(&nr_buf, "%llu", page_count) < 0)
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goto cleanup;
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if (virFileWriteStr(nr_path, nr_buf, 0) < 0) {
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virReportSystemError(errno,
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_("Unable to write to: %s"), nr_path);
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goto cleanup;
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}
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/* And now do the check. */
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VIR_FREE(nr_buf);
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if (virFileReadAll(nr_path, 1024, &nr_buf) < 0)
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goto cleanup;
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if (virStrToLong_ull(nr_buf, &end, 10, &nr_count) < 0 ||
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*end != '\n') {
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virReportError(VIR_ERR_OPERATION_FAILED,
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_("invalid number '%s' in '%s'"),
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nr_buf, nr_path);
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goto cleanup;
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}
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if (nr_count != page_count) {
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virReportError(VIR_ERR_OPERATION_FAILED,
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_("Unable to allocate %llu pages. Allocated only %llu"),
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page_count, nr_count);
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goto cleanup;
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}
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ret = 0;
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cleanup:
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VIR_FREE(nr_buf);
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VIR_FREE(nr_path);
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return ret;
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}
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#else /* #ifdef __linux__ */
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int
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virNumaGetPageInfo(int node ATTRIBUTE_UNUSED,
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@ -866,4 +962,16 @@ virNumaGetPages(int node ATTRIBUTE_UNUSED,
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_("page info is not supported on this platform"));
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return -1;
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}
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int
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virNumaSetPagePoolSize(int node ATTRIBUTE_UNUSED,
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unsigned int page_size ATTRIBUTE_UNUSED,
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unsigned long long page_count ATTRIBUTE_UNUSED,
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bool add ATTRIBUTE_UNUSED)
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{
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virReportError(VIR_ERR_OPERATION_UNSUPPORTED, "%s",
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_("page pool allocation is not supported on this platform"));
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return -1;
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}
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#endif /* #ifdef __linux__ */
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@ -59,4 +59,8 @@ int virNumaGetPages(int node,
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unsigned int **pages_free,
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size_t *npages)
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ATTRIBUTE_NONNULL(5);
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int virNumaSetPagePoolSize(int node,
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unsigned int page_size,
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unsigned long long page_count,
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bool add);
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#endif /* __VIR_NUMA_H__ */
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