From b901bb89324ae65573c5f5c0a126cb864096b77c Mon Sep 17 00:00:00 2001 From: Matthew Auld Date: Fri, 6 Oct 2017 23:18:15 +0100 Subject: drm/i915/gemfs: enable THP Enable transparent-huge-pages through gemfs by mounting with huge=within_size. v2: sprinkle within_size comment Signed-off-by: Matthew Auld Cc: Joonas Lahtinen Cc: Chris Wilson Reviewed-by: Chris Wilson Reviewed-by: Joonas Lahtinen Link: https://patchwork.freedesktop.org/patch/msgid/20171006145041.21673-4-matthew.auld@intel.com Signed-off-by: Chris Wilson Link: https://patchwork.freedesktop.org/patch/msgid/20171006221833.32439-3-chris@chris-wilson.co.uk --- drivers/gpu/drm/i915/i915_gemfs.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/drivers/gpu/drm/i915/i915_gemfs.c b/drivers/gpu/drm/i915/i915_gemfs.c index 168d0bd98f60..e2993857df37 100644 --- a/drivers/gpu/drm/i915/i915_gemfs.c +++ b/drivers/gpu/drm/i915/i915_gemfs.c @@ -24,6 +24,7 @@ #include #include +#include #include "i915_drv.h" #include "i915_gemfs.h" @@ -41,6 +42,27 @@ int i915_gemfs_init(struct drm_i915_private *i915) if (IS_ERR(gemfs)) return PTR_ERR(gemfs); + /* + * Enable huge-pages for objects that are at least HPAGE_PMD_SIZE, most + * likely 2M. Note that within_size may overallocate huge-pages, if say + * we allocate an object of size 2M + 4K, we may get 2M + 2M, but under + * memory pressure shmem should split any huge-pages which can be + * shrunk. + */ + + if (has_transparent_hugepage()) { + struct super_block *sb = gemfs->mnt_sb; + char options[] = "huge=within_size"; + int flags = 0; + int err; + + err = sb->s_op->remount_fs(sb, &flags, options); + if (err) { + kern_unmount(gemfs); + return err; + } + } + i915->mm.gemfs = gemfs; return 0; -- cgit v1.2.3