Abhinav's work on usemem_mincore.c

Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>

1 files changed, 32 insertions, 0 deletions

diff --git a/usemem_mincore.c b/usemem_mincore.c
new file mode 100644
index 0000000..9e06d61
--- /dev/null
+++ b/usemem_mincore.c
@@ -0,0 +1,32 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+#include <sys/mman.h>
+
+#define HUGEPAGE_SIZE (2UL * 1024 * 1024)  /* Assuming 2MB hugepage size */
+
+unsigned char *mincore_hugepages(unsigned char *addr, unsigned long bytes)
+{
+	/* hugepage size assumed to be 2MB and */
+	unsigned long length_of_vector = (bytes / HUGEPAGE_SIZE) + 1;
+	unsigned char *ptr = NULL; /* initialize to NULL */
+
+	/* allocate 'length_of_vector' bytes for mincore page information */
+	if ((ptr = (unsigned char *)malloc(length_of_vector)) == NULL) {
+		fprintf(stderr, "Unable to allocate requested memory");
+		fprintf(stdout, "exiting now...");
+		exit(1);
+	}
+
+	if ((mincore(addr, bytes, ptr)) == -1) {
+		fprintf(stderr, "mincore failed with error: %s", strerror(errno));
+		free(ptr);
+		exit(1);
+	}
+
+	return ptr;
+}
+