10:10 a.m.
From: Bjoern Walk <bwalk(a)linux.vnet.ibm.com>
All different architectures use the same copy-pasted code to parse
processor frequency information from /proc/cpuinfo. Let's extract that
code into a function to avoid repetition.
We now also tolerate if the parsing of /proc/cpuinfo is not successful
and just report a warning instead of bailing out and abandoning the rest
of the CPU information.
Reviewed-by: Marc Hartmayer <mhartmay(a)linux.vnet.ibm.com>
Reviewed-by: Boris Fiuczynski <fiuczy(a)linux.vnet.ibm.com>
Reviewed-by: Andrea Bolognani <abologna(a)redhat.com>
Signed-off-by: Bjoern Walk <bwalk(a)linux.vnet.ibm.com>
---
Changes from Bjoern's original version:
* rename virHostCPUParseFrequencyLine() to
virHostCPUParseFrequencyString().
src/util/virhostcpu.c | 136 +++++++++++++++++++++-----------------------------
1 file changed, 57 insertions(+), 79 deletions(-)
diff --git a/src/util/virhostcpu.c b/src/util/virhostcpu.c
index c485a9721..3091a92c0 100644
--- a/src/util/virhostcpu.c
+++ b/src/util/virhostcpu.c
@@ -508,6 +508,61 @@ virHostCPUHasValidSubcoreConfiguration(int threads_per_subcore)
return ret;
}
+static int
+virHostCPUParseFrequencyString(const char *str,
+ unsigned int *mhz)
+{
+ char *p;
+ unsigned int ui;
+
+ while (*str && c_isspace(*str))
+ str++;
+
+ if (*str != ':' || !str[1]) {
+ virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+ _("parsing cpu MHz from cpuinfo"));
+ return -1;
+ }
+
+ if (virStrToLong_ui(str + 1, &p, 10, &ui) == 0 &&
+ /* Accept trailing fractional part. */
+ (*p == '\0' || *p == '.' || c_isspace(*p)))
+ *mhz = ui;
+
+ return 0;
+}
+
+static int
+virHostCPUParseFrequency(FILE *cpuinfo,
+ virArch arch,
+ unsigned int *mhz)
+{
+ const char *prefix = NULL;
+ char line[1024];
+
+ if (ARCH_IS_X86(arch))
+ prefix = "cpu MHz";
+ else if (ARCH_IS_PPC(arch))
+ prefix = "clock";
+ else if (ARCH_IS_ARM(arch))
+ prefix = "BogoMIPS";
+
+ if (!prefix) {
+ VIR_WARN("Parser for /proc/cpuinfo needs to be adapted for your
architecture");
+ return 1;
+ }
+
+ while (fgets(line, sizeof(line), cpuinfo) != NULL) {
+ if (!STRPREFIX(line, prefix))
+ continue;
+
+ if (virHostCPUParseFrequencyString(line + strlen(prefix), mhz) < 0)
+ return -1;
+ }
+
+ return 0;
+}
+
int
virHostCPUGetInfoPopulateLinux(FILE *cpuinfo,
virArch arch,
@@ -520,7 +575,6 @@ virHostCPUGetInfoPopulateLinux(FILE *cpuinfo,
{
virBitmapPtr present_cpus_map = NULL;
virBitmapPtr online_cpus_map = NULL;
- char line[1024];
DIR *nodedir = NULL;
struct dirent *nodedirent = NULL;
int nodecpus, nodecores, nodesockets, nodethreads, offline = 0;
@@ -535,84 +589,8 @@ virHostCPUGetInfoPopulateLinux(FILE *cpuinfo,
*cpus = *nodes = *sockets = *cores = *threads = 0;
/* Start with parsing CPU clock speed from /proc/cpuinfo */
- while (fgets(line, sizeof(line), cpuinfo) != NULL) {
- if (ARCH_IS_X86(arch)) {
- char *buf = line;
- if (STRPREFIX(buf, "cpu MHz")) {
- char *p;
- unsigned int ui;
-
- buf += 7;
- while (*buf && c_isspace(*buf))
- buf++;
-
- if (*buf != ':' || !buf[1]) {
- virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
- _("parsing cpu MHz from cpuinfo"));
- goto cleanup;
- }
-
- if (virStrToLong_ui(buf+1, &p, 10, &ui) == 0 &&
- /* Accept trailing fractional part. */
- (*p == '\0' || *p == '.' || c_isspace(*p)))
- *mhz = ui;
- }
- } else if (ARCH_IS_PPC(arch)) {
- char *buf = line;
- if (STRPREFIX(buf, "clock")) {
- char *p;
- unsigned int ui;
-
- buf += 5;
- while (*buf && c_isspace(*buf))
- buf++;
-
- if (*buf != ':' || !buf[1]) {
- virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
- _("parsing cpu MHz from cpuinfo"));
- goto cleanup;
- }
-
- if (virStrToLong_ui(buf+1, &p, 10, &ui) == 0 &&
- /* Accept trailing fractional part. */
- (*p == '\0' || *p == '.' || c_isspace(*p)))
- *mhz = ui;
- /* No other interesting infos are available in /proc/cpuinfo.
- * However, there is a line identifying processor's version,
- * identification and machine, but we don't want it to be caught
- * and parsed in next iteration, because it is not in expected
- * format and thus lead to error. */
- }
- } else if (ARCH_IS_ARM(arch)) {
- char *buf = line;
- if (STRPREFIX(buf, "BogoMIPS")) {
- char *p;
- unsigned int ui;
-
- buf += 8;
- while (*buf && c_isspace(*buf))
- buf++;
-
- if (*buf != ':' || !buf[1]) {
- virReportError(VIR_ERR_INTERNAL_ERROR,
- "%s", _("parsing cpu MHz from
cpuinfo"));
- goto cleanup;
- }
-
- if (virStrToLong_ui(buf+1, &p, 10, &ui) == 0
- /* Accept trailing fractional part. */
- && (*p == '\0' || *p == '.' ||
c_isspace(*p)))
- *mhz = ui;
- }
- } else if (ARCH_IS_S390(arch)) {
- /* s390x has no realistic value for CPU speed,
- * assign a value of zero to signify this */
- *mhz = 0;
- } else {
- VIR_WARN("Parser for /proc/cpuinfo needs to be adapted for your
architecture");
- break;
- }
- }
+ if (virHostCPUParseFrequency(cpuinfo, arch, mhz) < 0)
+ VIR_WARN("Unable to parse processor frequency information from
/proc/cpuinfo");
/* Get information about what CPUs are present in the host and what
* CPUs are online, so that we don't have to so for each node */
--
2.14.3