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util: Rewrite virHostCPUCountThreadSiblings()

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We already have a function which parses
thread_siblings_list for a CPU and returns the
corresponding bitmap, and a bunch of utility functions
that perform operations on bitmaps such as counting
the number of set bits: use those to implement the
function instead of having an additional ad-hoc parser
for thread_siblings.

Signed-off-by: Andrea Bolognani <abologna@redhat.com>
This commit is contained in:
Andrea Bolognani 2018-08-02 16:15:02 +02:00
parent 37e64f6508
commit 794513e89d
1 changed files with 16 additions and 29 deletions
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45
src/util/virhostcpu.c
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@ -200,35 +200,6 @@ virHostCPUGetStatsFreeBSD(int cpuNum,
# define LINUX_NB_CPU_STATS 4
static unsigned long
virHostCPUCountThreadSiblings(unsigned int cpu)
{
unsigned long ret = 0;
int rv = -1;
char *str = NULL;
size_t i;
rv = virFileReadValueString(&str,
"%s/cpu/cpu%u/topology/thread_siblings",
SYSFS_SYSTEM_PATH, cpu);
if (rv == -2) {
ret = 1;
goto cleanup;
}
if (rv < 0)
goto cleanup;
for (i = 0; str[i] != '\0'; i++) {
if (c_isxdigit(str[i]))
ret += count_one_bits(virHexToBin(str[i]));
}
cleanup:
VIR_FREE(str);
return ret;
}
int
virHostCPUGetSocket(unsigned int cpu, unsigned int *socket)
{
@ -289,6 +260,22 @@ virHostCPUGetSiblingsList(unsigned int cpu)
return ret;
}
static unsigned long
virHostCPUCountThreadSiblings(unsigned int cpu)
{
virBitmapPtr siblings_map;
unsigned long ret = 0;
if (!(siblings_map = virHostCPUGetSiblingsList(cpu)))
goto cleanup;
ret = virBitmapCountBits(siblings_map);
cleanup:
virBitmapFree(siblings_map);
return ret;
}
/* parses a node entry, returning number of processors in the node and
* filling arguments */
static int