From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Mon, 21 Jul 2014 15:15:24 +0000 (+0100)
Subject: linux: Flush page/buffer cache before querying available memory
X-Git-Tag: intel-gpu-tools-1.8~146
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=70e6ed92abbca575f03f5a28402ef1eb9a6b97b8;p=platform%2Fupstream%2Fintel-gpu-tools.git

linux: Flush page/buffer cache before querying available memory

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

diff --git a/lib/intel_os.c b/lib/intel_os.c
index 2a29cc0..0d4f43d 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);