The drop_caches sysctl has a max value of 4, so writing 7 to it just fails. Avoid the earlier two-writes problem by seeking to the beginning between writes. Signed-off-by: Petri Latvala <petri.latvala@xxxxxxxxx> --- lib/intel_os.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/lib/intel_os.c b/lib/intel_os.c index b9f970d..cb3b062 100644 --- a/lib/intel_os.c +++ b/lib/intel_os.c @@ -299,11 +299,16 @@ void intel_purge_vm_caches(void) if (fd < 0) return; + /* BIT(2): Be quiet. Cannot be combined with other operations, + * the sysctl has a max value of 4. + */ + igt_ignore_warn(write(fd, "4\n", 2)); + igt_assert(lseek(fd, 0, SEEK_SET) == 0); + /* BIT(0): Drop page cache * BIT(1): Drop slab cache - * BIT(2): Be quiet in future */ - igt_ignore_warn(write(fd, "7\n", 2)); + igt_ignore_warn(write(fd, "3\n", 2)); close(fd); } -- 2.9.3 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
