[PATCH 2/2] drm/i915: enable THP for gemfs
Matthew Auld
matthew.auld at intel.com
Fri May 26 16:58:56 UTC 2017
Signed-off-by: Matthew Auld <matthew.auld at intel.com>
---
drivers/gpu/drm/i915/i915_gemfs.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_gemfs.c b/drivers/gpu/drm/i915/i915_gemfs.c
index 2aceec4e6f19..e1d188a915f1 100644
--- a/drivers/gpu/drm/i915/i915_gemfs.c
+++ b/drivers/gpu/drm/i915/i915_gemfs.c
@@ -41,6 +41,10 @@ int i915_gemfs_create(struct drm_i915_private *i915)
{
struct file_system_type *type;
struct vfsmount *gemfs_mnt;
+ struct super_block *sb;
+ char options[] = "huge=within_size";
+ int flags = 0;
+ int ret;
type = get_fs_type("tmpfs");
if (!type)
@@ -50,6 +54,23 @@ int i915_gemfs_create(struct drm_i915_private *i915)
if (IS_ERR(gemfs_mnt))
return PTR_ERR(gemfs_mnt);
+ sb = gemfs_mnt->mnt_sb;
+
+#if defined(CONFIG_TRANSPARENT_HUGE_PAGECACHE)
+ /* Idealy we would just pass the mount options when mounting, but for
+ * some reason shmem chooses not to parse the options for MS_KERNMOUNT,
+ * probably because shm_mnt is the only tmpfs kernel mount other than
+ * this, where the mount options aren't used. To workaround this we do
+ * a remount, which is fairly inexpensive, where we know the options are
+ * never igonored.
+ */
+ ret = sb->s_op->remount_fs(sb, &flags, options);
+ if (ret) {
+ kern_unmount(gemfs_mnt);
+ return ret;
+ }
+
+#endif
i915->gemfs_mnt = gemfs_mnt;
return 0;
--
2.9.4
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