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It is no longer needed thanks to the great virfilewrapper.c. And this way we don't have to add a new set of functions for each prefixed path. While on that, add two functions that weren't there before, string and scaled integer reading ones. Also increase the length of the string being read by one to accompany for the optional newline at the end (i.e. change INT_STRLEN_BOUND to INT_BUFSIZE_BOUND). Signed-off-by: Martin Kletzander <mkletzan@redhat.com>
195 lines
4.7 KiB
C
195 lines
4.7 KiB
C
/*
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* virnumamock.c: Mock some virNuma functions using sysfs
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#include "internal.h"
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#include "virmock.h"
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#include "virnuma.h"
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#include "virfile.h"
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#include "viralloc.h"
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#include "virstring.h"
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#define VIR_FROM_THIS VIR_FROM_NONE
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#define SYSFS_SYSTEM_PATH "/sys/devices/system"
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static int numa_avail = -1;
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/*
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* Poor man's mocked NUMA guesser. We basically check if
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* /sys/devices/system/node (where /sys/devices/system can already be mocked or
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* changed in the tests) exists and cache the result.
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*/
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bool
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virNumaIsAvailable(void)
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{
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if (numa_avail < 0) {
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char *sysfs_node_path = NULL;
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if (virAsprintfQuiet(&sysfs_node_path, "%s/node", SYSFS_SYSTEM_PATH) < 0)
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return false;
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numa_avail = virFileExists(sysfs_node_path);
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VIR_FREE(sysfs_node_path);
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}
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/*
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* Quite a few more things need to be mocked if NUMA is not available and
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* you are using this file. Do not remove the abort() call below unless you
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* make sure all under virCapabilitiesInitNUMAFake() is mocked (and whatever
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* might have changed since this comment was added. You are welcome.
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*/
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if (!numa_avail)
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abort();
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return numa_avail;
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}
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int
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virNumaGetMaxNode(void)
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{
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int ret = -1;
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virBitmapPtr map = NULL;
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if (virFileReadValueBitmap(&map, "%s/node/online", SYSFS_SYSTEM_PATH) < 0)
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return -1;
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ret = virBitmapLastSetBit(map);
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virBitmapFree(map);
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return ret;
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}
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bool
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virNumaNodeIsAvailable(int node)
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{
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bool ret = false;
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virBitmapPtr map = NULL;
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if (virFileReadValueBitmap(&map, "%s/node/online", SYSFS_SYSTEM_PATH) < 0)
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return false;
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ret = virBitmapIsBitSet(map, node);
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virBitmapFree(map);
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return ret;
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}
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int
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virNumaGetNodeMemory(int node,
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unsigned long long *memsize,
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unsigned long long *memfree)
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{
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const unsigned long long base = 1 << 30;
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if (memsize)
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*memsize = base * (node + 1);
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if (memfree)
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*memfree = base;
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return 0;
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}
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int
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virNumaGetDistances(int node ATTRIBUTE_UNUSED,
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int **distances,
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int *ndistances)
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{
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*distances = NULL;
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*ndistances = 0;
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return 0;
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}
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/*
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* TODO: Adapt virNumaGetHugePageInfo{Path,Dir} to use sysfs so that the
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* paths can be modified and this function can be thrown away and instead we'd
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* have copied info from /sys (as we do with /sys/devices/system).
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*/
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int
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virNumaGetPages(int node,
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unsigned int **pages_size,
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unsigned int **pages_avail,
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unsigned int **pages_free,
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size_t *npages)
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{
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const int pages_def[] = { 4, 2 * 1024, 1 * 1024 * 1024};
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const int npages_def = ARRAY_CARDINALITY(pages_def);
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size_t i = 0;
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if (pages_size)
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*pages_size = NULL;
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if (pages_avail)
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*pages_avail = NULL;
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if (pages_free)
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*pages_free = NULL;
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*npages = 0;
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if ((pages_size && VIR_ALLOC_N(*pages_size, npages_def) < 0) ||
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(pages_avail && VIR_ALLOC_N(*pages_avail, npages_def) < 0) ||
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(pages_free && VIR_ALLOC_N(*pages_free, npages_def) < 0)) {
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VIR_FREE(*pages_size);
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VIR_FREE(*pages_avail);
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return -1;
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}
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*npages = npages_def;
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if (pages_size)
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memcpy(*pages_size, pages_def, sizeof(pages_def));
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node++;
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if (node <= 0)
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node = 32;
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if (pages_avail || pages_free) {
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for (i = 0; i < *npages; i++) {
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if (pages_avail)
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(*pages_avail)[i] = (node + i) * 2 << 10;
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if (pages_free)
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(*pages_free)[i] = (node + i) * 1 << 10;
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}
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}
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return 0;
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}
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int
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virNumaGetNodeCPUs(int node, virBitmapPtr *cpus)
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{
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int ret = -1;
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char *cpulist = NULL;
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if (virFileReadValueString(&cpulist,
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"%s/node/node%u/cpulist",
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SYSFS_SYSTEM_PATH, node) < 0)
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return -1;
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*cpus = virBitmapParseUnlimited(cpulist);
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if (!*cpus)
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goto cleanup;
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ret = virBitmapCountBits(*cpus);
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cleanup:
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VIR_FREE(cpulist);
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return ret;
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}
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