File pacemaker-libcrmcommon-function-get-number-of-C... of Package pacemaker

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File pacemaker-libcrmcommon-function-get-number-of-CPU-cores.patch of Package pacemaker

commit 89175e75f3b38b10ea163c1a8d621d1296570e7f
Author: Ken Gaillot <kgaillot@redhat.com>
Date:   Fri Apr 28 14:30:55 2017 -0500

Feature: libcrmcommon: add function to get number of CPU cores
    
    Compared to the previous implementation in crmd/throttle.c, this
    parses /proc/stat, which is smaller than /proc/cpuinfo.

diff --git a/include/crm/common/internal.h b/include/crm/common/internal.h
index 475128f2f..c34b03b89 100644
--- a/include/crm/common/internal.h
+++ b/include/crm/common/internal.h
@@ -54,6 +54,7 @@ int crm_write_sync(int fd, const char *contents);
 
 int crm_procfs_process_info(struct dirent *entry, char *name, int *pid);
 int crm_procfs_pid_of(const char *name);
+unsigned int crm_procfs_num_cores(void);
 
 
 /* internal XML schema functions (from xml.c) */
diff --git a/lib/common/procfs.c b/lib/common/procfs.c
index 12d01ff7a..fbbf9ebdd 100644
--- a/lib/common/procfs.c
+++ b/lib/common/procfs.c
@@ -28,6 +28,7 @@
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <dirent.h>
+#include <ctype.h>
 
 /*!
  * \internal
@@ -140,3 +141,32 @@ crm_procfs_pid_of(const char *name)
     closedir(dp);
     return pid;
 }
+
+/*!
+ * \internal
+ * \brief Calculate number of logical CPU cores from procfs
+ *
+ * \return Number of cores (or 1 if unable to determine)
+ */
+unsigned int
+crm_procfs_num_cores(void)
+{
+    int cores = 0;
+    FILE *stream = NULL;
+
+    /* Parse /proc/stat instead of /proc/cpuinfo because it's smaller */
+    stream = fopen("/proc/stat", "r");
+    if (stream == NULL) {
+        crm_perror(LOG_INFO, "Could not open /proc/stat");
+    } else {
+        char buffer[2048];
+
+        while (fgets(buffer, sizeof(buffer), stream)) {
+            if (!strncmp(buffer, "cpu", 3) && isdigit(buffer[3])) {
+                ++cores;
+            }
+        }
+        fclose(stream);
+    }
+    return cores? cores : 1;
+}

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File pacemaker-libcrmcommon-function-get-number-of-CPU-cores.patch of Package pacemaker

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