linux: Flush page/buffer cache before querying available memory

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 8 insertions, 1 deletions

diff --git a/lib/intel_os.c b/lib/intel_os.c
index 2a29cc02..0d4f43da 100644
--- a/lib/intel_os.c
+++ b/lib/intel_os.c
@@ -98,7 +98,14 @@ intel_get_avail_ram_mb(void)
 
 #ifdef HAVE_STRUCT_SYSINFO_TOTALRAM /* Linux */
 	struct sysinfo sysinf;
-	int ret;
+	int fd, ret;
+
+	fd = open("/proc/sys/vm/drop_caches", O_RDWR);
+	if (fd != -1) {
+		ret = write(fd, "3", 2);
+		close(fd);
+		(void)ret;
+	}
 
 	ret = sysinfo(&sysinf);
 	assert(ret == 0);