diff --git a/Documentation/vm/unevictable-lru.rst b/Documentation/vm/unevictable-lru.rst
index fdd84cb8d511f4aef71f18f281ba629ad025d17f..b8e29f977f2d1f3a2898444bc9720c39ab9eaa4f 100644
--- a/Documentation/vm/unevictable-lru.rst
+++ b/Documentation/vm/unevictable-lru.rst
@@ -143,7 +143,7 @@ using a number of wrapper functions:
Query the address space, and return true if it is completely
unevictable.
-These are currently used in two places in the kernel:
+These are currently used in three places in the kernel:
(1) By ramfs to mark the address spaces of its inodes when they are created,
and this mark remains for the life of the inode.
@@ -154,6 +154,10 @@ These are currently used in two places in the kernel:
swapped out; the application must touch the pages manually if it wants to
ensure they're in memory.
+ (3) By the i915 driver to mark pinned address space until it's unpinned. The
+ amount of unevictable memory marked by i915 driver is roughly the bounded
+ object size in debugfs/dri/0/i915_gem_objects.
+
Detecting Unevictable Pages
---------------------------
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 347b3836c80950ba39090b8caded4b1c5d22d1fb..5b80b0c14aed7a9db3fc9dc7231bee2af54aabbd 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2382,11 +2382,23 @@ void __i915_gem_object_invalidate(struct drm_i915_gem_object *obj)
invalidate_mapping_pages(mapping, 0, (loff_t)-1);
}
+/*
+ * Move pages to appropriate lru and release the pagevec, decrementing the
+ * ref count of those pages.
+ */
+static void check_release_pagevec(struct pagevec *pvec)
+{
+ check_move_unevictable_pages(pvec);
+ __pagevec_release(pvec);
+ cond_resched();
+}
+
static void
i915_gem_object_put_pages_gtt(struct drm_i915_gem_object *obj,
struct sg_table *pages)
{
struct sgt_iter sgt_iter;
+ struct pagevec pvec;
struct page *page;
__i915_gem_object_release_shmem(obj, pages, true);
@@ -2396,6 +2408,9 @@ i915_gem_object_put_pages_gtt(struct drm_i915_gem_object *obj,
if (i915_gem_object_needs_bit17_swizzle(obj))
i915_gem_object_save_bit_17_swizzle(obj, pages);
+ mapping_clear_unevictable(file_inode(obj->base.filp)->i_mapping);
+
+ pagevec_init(&pvec);
for_each_sgt_page(page, sgt_iter, pages) {
if (obj->mm.dirty)
set_page_dirty(page);
@@ -2403,9 +2418,11 @@ i915_gem_object_put_pages_gtt(struct drm_i915_gem_object *obj,
if (obj->mm.madv == I915_MADV_WILLNEED)
mark_page_accessed(page);
- put_page(page);
- cond_resched();
+ if (!pagevec_add(&pvec, page))
+ check_release_pagevec(&pvec);
}
+ if (pagevec_count(&pvec))
+ check_release_pagevec(&pvec);
obj->mm.dirty = false;
sg_free_table(pages);
@@ -2526,6 +2543,7 @@ static int i915_gem_object_get_pages_gtt(struct drm_i915_gem_object *obj)
unsigned long last_pfn = 0; /* suppress gcc warning */
unsigned int max_segment = i915_sg_segment_size();
unsigned int sg_page_sizes;
+ struct pagevec pvec;
gfp_t noreclaim;
int ret;
@@ -2561,6 +2579,7 @@ static int i915_gem_object_get_pages_gtt(struct drm_i915_gem_object *obj)
* Fail silently without starting the shrinker
*/
mapping = obj->base.filp->f_mapping;
+ mapping_set_unevictable(mapping);
noreclaim = mapping_gfp_constraint(mapping, ~__GFP_RECLAIM);
noreclaim |= __GFP_NORETRY | __GFP_NOWARN;
@@ -2675,8 +2694,14 @@ static int i915_gem_object_get_pages_gtt(struct drm_i915_gem_object *obj)
err_sg:
sg_mark_end(sg);
err_pages:
- for_each_sgt_page(page, sgt_iter, st)
- put_page(page);
+ mapping_clear_unevictable(mapping);
+ pagevec_init(&pvec);
+ for_each_sgt_page(page, sgt_iter, st) {
+ if (!pagevec_add(&pvec, page))
+ check_release_pagevec(&pvec);
+ }
+ if (pagevec_count(&pvec))
+ check_release_pagevec(&pvec);
sg_free_table(st);
kfree(st);
diff --git a/include/linux/swap.h b/include/linux/swap.h
index 8e2c11e692baf9bba6380d63888cfbf5a206cf0b..6c95df96c9aa288902fe57545d58ecd4ccb79cb1 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -18,6 +18,8 @@ struct notifier_block;
struct bio;
+struct pagevec;
+
#define SWAP_FLAG_PREFER 0x8000 /* set if swap priority specified */
#define SWAP_FLAG_PRIO_MASK 0x7fff
#define SWAP_FLAG_PRIO_SHIFT 0
@@ -373,7 +375,7 @@ static inline int node_reclaim(struct pglist_data *pgdat, gfp_t mask,
#endif
extern int page_evictable(struct page *page);
-extern void check_move_unevictable_pages(struct page **, int nr_pages);
+extern void check_move_unevictable_pages(struct pagevec *pvec);
extern int kswapd_run(int nid);
extern void kswapd_stop(int nid);
diff --git a/mm/shmem.c b/mm/shmem.c
index 446942677cd4b88fad61e9a869a901bc66fadc41..0c3b005a59eb4b28dce083bd88eb503d13b9216a 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -781,7 +781,7 @@ void shmem_unlock_mapping(struct address_space *mapping)
break;
index = indices[pvec.nr - 1] + 1;
pagevec_remove_exceptionals(&pvec);
- check_move_unevictable_pages(pvec.pages, pvec.nr);
+ check_move_unevictable_pages(&pvec);
pagevec_release(&pvec);
cond_resched();
}
diff --git a/mm/vmscan.c b/mm/vmscan.c
index c7ce2c1612259c45896bae9739a288966a28c970..0dbc493026a27d4f59b7ca6d83a4c864340f99a1 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -46,6 +46,7 @@
#include <linux/delayacct.h>
#include <linux/sysctl.h>
#include <linux/oom.h>
+#include <linux/pagevec.h>
#include <linux/prefetch.h>
#include <linux/printk.h>
#include <linux/dax.h>
@@ -4162,17 +4163,16 @@ int page_evictable(struct page *page)
return ret;
}
-#ifdef CONFIG_SHMEM
/**
- * check_move_unevictable_pages - check pages for evictability and move to appropriate zone lru list
- * @pages: array of pages to check
- * @nr_pages: number of pages to check
+ * check_move_unevictable_pages - check pages for evictability and move to
+ * appropriate zone lru list
+ * @pvec: pagevec with lru pages to check
*
- * Checks pages for evictability and moves them to the appropriate lru list.
- *
- * This function is only used for SysV IPC SHM_UNLOCK.
+ * Checks pages for evictability, if an evictable page is in the unevictable
+ * lru list, moves it to the appropriate evictable lru list. This function
+ * should be only used for lru pages.
*/
-void check_move_unevictable_pages(struct page **pages, int nr_pages)
+void check_move_unevictable_pages(struct pagevec *pvec)
{
struct lruvec *lruvec;
struct pglist_data *pgdat = NULL;
@@ -4180,8 +4180,8 @@ void check_move_unevictable_pages(struct page **pages, int nr_pages)
int pgrescued = 0;
int i;
- for (i = 0; i < nr_pages; i++) {
- struct page *page = pages[i];
+ for (i = 0; i < pvec->nr; i++) {
+ struct page *page = pvec->pages[i];
struct pglist_data *pagepgdat = page_pgdat(page);
pgscanned++;
@@ -4213,4 +4213,4 @@ void check_move_unevictable_pages(struct page **pages, int nr_pages)
spin_unlock_irq(&pgdat->lru_lock);
}
}
-#endif /* CONFIG_SHMEM */
+EXPORT_SYMBOL_GPL(check_move_unevictable_pages);