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authorMichal Hocko <mhocko@suse.com>2017-09-13 16:28:29 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-09-13 18:53:16 -0700
commit0ee931c4e31a5efb134c76440405e9219f896e33 (patch)
treef87f98163759237da6f062bdec1cbe620f166b50 /drivers
parentd0dbf771309fecd73f4ac1566c1400cb12807ee2 (diff)
mm: treewide: remove GFP_TEMPORARY allocation flag
GFP_TEMPORARY was introduced by commit e12ba74d8ff3 ("Group short-lived and reclaimable kernel allocations") along with __GFP_RECLAIMABLE. It's primary motivation was to allow users to tell that an allocation is short lived and so the allocator can try to place such allocations close together and prevent long term fragmentation. As much as this sounds like a reasonable semantic it becomes much less clear when to use the highlevel GFP_TEMPORARY allocation flag. How long is temporary? Can the context holding that memory sleep? Can it take locks? It seems there is no good answer for those questions. The current implementation of GFP_TEMPORARY is basically GFP_KERNEL | __GFP_RECLAIMABLE which in itself is tricky because basically none of the existing caller provide a way to reclaim the allocated memory. So this is rather misleading and hard to evaluate for any benefits. I have checked some random users and none of them has added the flag with a specific justification. I suspect most of them just copied from other existing users and others just thought it might be a good idea to use without any measuring. This suggests that GFP_TEMPORARY just motivates for cargo cult usage without any reasoning. I believe that our gfp flags are quite complex already and especially those with highlevel semantic should be clearly defined to prevent from confusion and abuse. Therefore I propose dropping GFP_TEMPORARY and replace all existing users to simply use GFP_KERNEL. Please note that SLAB users with shrinkers will still get __GFP_RECLAIMABLE heuristic and so they will be placed properly for memory fragmentation prevention. I can see reasons we might want some gfp flag to reflect shorterm allocations but I propose starting from a clear semantic definition and only then add users with proper justification. This was been brought up before LSF this year by Matthew [1] and it turned out that GFP_TEMPORARY really doesn't have a clear semantic. It seems to be a heuristic without any measured advantage for most (if not all) its current users. The follow up discussion has revealed that opinions on what might be temporary allocation differ a lot between developers. So rather than trying to tweak existing users into a semantic which they haven't expected I propose to simply remove the flag and start from scratch if we really need a semantic for short term allocations. [1] http://lkml.kernel.org/r/20170118054945.GD18349@bombadil.infradead.org [akpm@linux-foundation.org: fix typo] [akpm@linux-foundation.org: coding-style fixes] [sfr@canb.auug.org.au: drm/i915: fix up] Link: http://lkml.kernel.org/r/20170816144703.378d4f4d@canb.auug.org.au Link: http://lkml.kernel.org/r/20170728091904.14627-1-mhocko@kernel.org Signed-off-by: Michal Hocko <mhocko@suse.com> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Acked-by: Mel Gorman <mgorman@suse.de> Acked-by: Vlastimil Babka <vbabka@suse.cz> Cc: Matthew Wilcox <willy@infradead.org> Cc: Neil Brown <neilb@suse.de> Cc: "Theodore Ts'o" <tytso@mit.edu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/gpu/drm/drm_blend.c2
-rw-r--r--drivers/gpu/drm/drm_dp_dual_mode_helper.c2
-rw-r--r--drivers/gpu/drm/drm_scdc_helper.c2
-rw-r--r--drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c2
-rw-r--r--drivers/gpu/drm/i915/i915_gem.c2
-rw-r--r--drivers/gpu/drm/i915/i915_gem_execbuffer.c12
-rw-r--r--drivers/gpu/drm/i915/i915_gem_gtt.c2
-rw-r--r--drivers/gpu/drm/i915/i915_gem_userptr.c4
-rw-r--r--drivers/gpu/drm/i915/i915_gpu_error.c6
-rw-r--r--drivers/gpu/drm/i915/selftests/i915_random.c2
-rw-r--r--drivers/gpu/drm/i915/selftests/intel_breadcrumbs.c10
-rw-r--r--drivers/gpu/drm/i915/selftests/intel_uncore.c2
-rw-r--r--drivers/gpu/drm/lib/drm_random.c2
-rw-r--r--drivers/gpu/drm/msm/msm_gem_submit.c2
-rw-r--r--drivers/gpu/drm/selftests/test-drm_mm.c4
-rw-r--r--drivers/misc/cxl/pci.c2
-rw-r--r--drivers/xen/gntalloc.c2
17 files changed, 30 insertions, 30 deletions
diff --git a/drivers/gpu/drm/drm_blend.c b/drivers/gpu/drm/drm_blend.c
index db6aeec50b82..2e5e089dd912 100644
--- a/drivers/gpu/drm/drm_blend.c
+++ b/drivers/gpu/drm/drm_blend.c
@@ -319,7 +319,7 @@ static int drm_atomic_helper_crtc_normalize_zpos(struct drm_crtc *crtc,
DRM_DEBUG_ATOMIC("[CRTC:%d:%s] calculating normalized zpos values\n",
crtc->base.id, crtc->name);
- states = kmalloc_array(total_planes, sizeof(*states), GFP_TEMPORARY);
+ states = kmalloc_array(total_planes, sizeof(*states), GFP_KERNEL);
if (!states)
return -ENOMEM;
diff --git a/drivers/gpu/drm/drm_dp_dual_mode_helper.c b/drivers/gpu/drm/drm_dp_dual_mode_helper.c
index 80e62f669321..0ef9011a1856 100644
--- a/drivers/gpu/drm/drm_dp_dual_mode_helper.c
+++ b/drivers/gpu/drm/drm_dp_dual_mode_helper.c
@@ -111,7 +111,7 @@ ssize_t drm_dp_dual_mode_write(struct i2c_adapter *adapter,
void *data;
int ret;
- data = kmalloc(msg.len, GFP_TEMPORARY);
+ data = kmalloc(msg.len, GFP_KERNEL);
if (!data)
return -ENOMEM;
diff --git a/drivers/gpu/drm/drm_scdc_helper.c b/drivers/gpu/drm/drm_scdc_helper.c
index 7d1b0f011d33..935653eb3616 100644
--- a/drivers/gpu/drm/drm_scdc_helper.c
+++ b/drivers/gpu/drm/drm_scdc_helper.c
@@ -102,7 +102,7 @@ ssize_t drm_scdc_write(struct i2c_adapter *adapter, u8 offset,
void *data;
int err;
- data = kmalloc(1 + size, GFP_TEMPORARY);
+ data = kmalloc(1 + size, GFP_KERNEL);
if (!data)
return -ENOMEM;
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c b/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c
index a7ff2e4c00d2..026ef4e02f85 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c
@@ -37,7 +37,7 @@ static struct etnaviv_gem_submit *submit_create(struct drm_device *dev,
struct etnaviv_gem_submit *submit;
size_t sz = size_vstruct(nr, sizeof(submit->bos[0]), sizeof(*submit));
- submit = kmalloc(sz, GFP_TEMPORARY | __GFP_NOWARN | __GFP_NORETRY);
+ submit = kmalloc(sz, GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY);
if (submit) {
submit->dev = dev;
submit->gpu = gpu;
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 57317715977f..19404c96eeb1 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2540,7 +2540,7 @@ static void *i915_gem_object_map(const struct drm_i915_gem_object *obj,
if (n_pages > ARRAY_SIZE(stack_pages)) {
/* Too big for stack -- allocate temporary array instead */
- pages = kvmalloc_array(n_pages, sizeof(*pages), GFP_TEMPORARY);
+ pages = kvmalloc_array(n_pages, sizeof(*pages), GFP_KERNEL);
if (!pages)
return NULL;
}
diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index 50d5e24f91a9..92437f455b43 100644
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -293,7 +293,7 @@ static int eb_create(struct i915_execbuffer *eb)
* as possible to perform the allocation and warn
* if it fails.
*/
- flags = GFP_TEMPORARY;
+ flags = GFP_KERNEL;
if (size > 1)
flags |= __GFP_NORETRY | __GFP_NOWARN;
@@ -1515,7 +1515,7 @@ static int eb_copy_relocations(const struct i915_execbuffer *eb)
urelocs = u64_to_user_ptr(eb->exec[i].relocs_ptr);
size = nreloc * sizeof(*relocs);
- relocs = kvmalloc_array(size, 1, GFP_TEMPORARY);
+ relocs = kvmalloc_array(size, 1, GFP_KERNEL);
if (!relocs) {
kvfree(relocs);
err = -ENOMEM;
@@ -2077,7 +2077,7 @@ get_fence_array(struct drm_i915_gem_execbuffer2 *args,
return ERR_PTR(-EFAULT);
fences = kvmalloc_array(args->num_cliprects, sizeof(*fences),
- __GFP_NOWARN | GFP_TEMPORARY);
+ __GFP_NOWARN | GFP_KERNEL);
if (!fences)
return ERR_PTR(-ENOMEM);
@@ -2463,9 +2463,9 @@ i915_gem_execbuffer(struct drm_device *dev, void *data,
/* Copy in the exec list from userland */
exec_list = kvmalloc_array(args->buffer_count, sizeof(*exec_list),
- __GFP_NOWARN | GFP_TEMPORARY);
+ __GFP_NOWARN | GFP_KERNEL);
exec2_list = kvmalloc_array(args->buffer_count + 1, sz,
- __GFP_NOWARN | GFP_TEMPORARY);
+ __GFP_NOWARN | GFP_KERNEL);
if (exec_list == NULL || exec2_list == NULL) {
DRM_DEBUG("Failed to allocate exec list for %d buffers\n",
args->buffer_count);
@@ -2543,7 +2543,7 @@ i915_gem_execbuffer2(struct drm_device *dev, void *data,
/* Allocate an extra slot for use by the command parser */
exec2_list = kvmalloc_array(args->buffer_count + 1, sz,
- __GFP_NOWARN | GFP_TEMPORARY);
+ __GFP_NOWARN | GFP_KERNEL);
if (exec2_list == NULL) {
DRM_DEBUG("Failed to allocate exec list for %d buffers\n",
args->buffer_count);
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 0d5a988b3867..e2410eb5d96e 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -3231,7 +3231,7 @@ intel_rotate_pages(struct intel_rotation_info *rot_info,
/* Allocate a temporary list of source pages for random access. */
page_addr_list = kvmalloc_array(n_pages,
sizeof(dma_addr_t),
- GFP_TEMPORARY);
+ GFP_KERNEL);
if (!page_addr_list)
return ERR_PTR(ret);
diff --git a/drivers/gpu/drm/i915/i915_gem_userptr.c b/drivers/gpu/drm/i915/i915_gem_userptr.c
index 23fd18bd1b56..709efe2357ea 100644
--- a/drivers/gpu/drm/i915/i915_gem_userptr.c
+++ b/drivers/gpu/drm/i915/i915_gem_userptr.c
@@ -507,7 +507,7 @@ __i915_gem_userptr_get_pages_worker(struct work_struct *_work)
ret = -ENOMEM;
pinned = 0;
- pvec = kvmalloc_array(npages, sizeof(struct page *), GFP_TEMPORARY);
+ pvec = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
if (pvec != NULL) {
struct mm_struct *mm = obj->userptr.mm->mm;
unsigned int flags = 0;
@@ -643,7 +643,7 @@ i915_gem_userptr_get_pages(struct drm_i915_gem_object *obj)
if (mm == current->mm) {
pvec = kvmalloc_array(num_pages, sizeof(struct page *),
- GFP_TEMPORARY |
+ GFP_KERNEL |
__GFP_NORETRY |
__GFP_NOWARN);
if (pvec) /* defer to worker if malloc fails */
diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
index ed5a1eb839ad..0c779671fe2d 100644
--- a/drivers/gpu/drm/i915/i915_gpu_error.c
+++ b/drivers/gpu/drm/i915/i915_gpu_error.c
@@ -787,16 +787,16 @@ int i915_error_state_buf_init(struct drm_i915_error_state_buf *ebuf,
*/
ebuf->size = count + 1 > PAGE_SIZE ? count + 1 : PAGE_SIZE;
ebuf->buf = kmalloc(ebuf->size,
- GFP_TEMPORARY | __GFP_NORETRY | __GFP_NOWARN);
+ GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN);
if (ebuf->buf == NULL) {
ebuf->size = PAGE_SIZE;
- ebuf->buf = kmalloc(ebuf->size, GFP_TEMPORARY);
+ ebuf->buf = kmalloc(ebuf->size, GFP_KERNEL);
}
if (ebuf->buf == NULL) {
ebuf->size = 128;
- ebuf->buf = kmalloc(ebuf->size, GFP_TEMPORARY);
+ ebuf->buf = kmalloc(ebuf->size, GFP_KERNEL);
}
if (ebuf->buf == NULL)
diff --git a/drivers/gpu/drm/i915/selftests/i915_random.c b/drivers/gpu/drm/i915/selftests/i915_random.c
index d044bf9a6feb..222c511bea49 100644
--- a/drivers/gpu/drm/i915/selftests/i915_random.c
+++ b/drivers/gpu/drm/i915/selftests/i915_random.c
@@ -62,7 +62,7 @@ unsigned int *i915_random_order(unsigned int count, struct rnd_state *state)
{
unsigned int *order, i;
- order = kmalloc_array(count, sizeof(*order), GFP_TEMPORARY);
+ order = kmalloc_array(count, sizeof(*order), GFP_KERNEL);
if (!order)
return order;
diff --git a/drivers/gpu/drm/i915/selftests/intel_breadcrumbs.c b/drivers/gpu/drm/i915/selftests/intel_breadcrumbs.c
index 7276194c04f7..828904b7d468 100644
--- a/drivers/gpu/drm/i915/selftests/intel_breadcrumbs.c
+++ b/drivers/gpu/drm/i915/selftests/intel_breadcrumbs.c
@@ -117,12 +117,12 @@ static int igt_random_insert_remove(void *arg)
mock_engine_reset(engine);
- waiters = kvmalloc_array(count, sizeof(*waiters), GFP_TEMPORARY);
+ waiters = kvmalloc_array(count, sizeof(*waiters), GFP_KERNEL);
if (!waiters)
goto out_engines;
bitmap = kcalloc(DIV_ROUND_UP(count, BITS_PER_LONG), sizeof(*bitmap),
- GFP_TEMPORARY);
+ GFP_KERNEL);
if (!bitmap)
goto out_waiters;
@@ -187,12 +187,12 @@ static int igt_insert_complete(void *arg)
mock_engine_reset(engine);
- waiters = kvmalloc_array(count, sizeof(*waiters), GFP_TEMPORARY);
+ waiters = kvmalloc_array(count, sizeof(*waiters), GFP_KERNEL);
if (!waiters)
goto out_engines;
bitmap = kcalloc(DIV_ROUND_UP(count, BITS_PER_LONG), sizeof(*bitmap),
- GFP_TEMPORARY);
+ GFP_KERNEL);
if (!bitmap)
goto out_waiters;
@@ -368,7 +368,7 @@ static int igt_wakeup(void *arg)
mock_engine_reset(engine);
- waiters = kvmalloc_array(count, sizeof(*waiters), GFP_TEMPORARY);
+ waiters = kvmalloc_array(count, sizeof(*waiters), GFP_KERNEL);
if (!waiters)
goto out_engines;
diff --git a/drivers/gpu/drm/i915/selftests/intel_uncore.c b/drivers/gpu/drm/i915/selftests/intel_uncore.c
index 2d0fef2cfca6..3cac22eb47ce 100644
--- a/drivers/gpu/drm/i915/selftests/intel_uncore.c
+++ b/drivers/gpu/drm/i915/selftests/intel_uncore.c
@@ -127,7 +127,7 @@ static int intel_uncore_check_forcewake_domains(struct drm_i915_private *dev_pri
return 0;
valid = kzalloc(BITS_TO_LONGS(FW_RANGE) * sizeof(*valid),
- GFP_TEMPORARY);
+ GFP_KERNEL);
if (!valid)
return -ENOMEM;
diff --git a/drivers/gpu/drm/lib/drm_random.c b/drivers/gpu/drm/lib/drm_random.c
index 7b12a68c3b54..a78c4b483e8d 100644
--- a/drivers/gpu/drm/lib/drm_random.c
+++ b/drivers/gpu/drm/lib/drm_random.c
@@ -28,7 +28,7 @@ unsigned int *drm_random_order(unsigned int count, struct rnd_state *state)
{
unsigned int *order, i;
- order = kmalloc_array(count, sizeof(*order), GFP_TEMPORARY);
+ order = kmalloc_array(count, sizeof(*order), GFP_KERNEL);
if (!order)
return order;
diff --git a/drivers/gpu/drm/msm/msm_gem_submit.c b/drivers/gpu/drm/msm/msm_gem_submit.c
index 8a75c0bd8a78..5d0a75d4b249 100644
--- a/drivers/gpu/drm/msm/msm_gem_submit.c
+++ b/drivers/gpu/drm/msm/msm_gem_submit.c
@@ -40,7 +40,7 @@ static struct msm_gem_submit *submit_create(struct drm_device *dev,
if (sz > SIZE_MAX)
return NULL;
- submit = kmalloc(sz, GFP_TEMPORARY | __GFP_NOWARN | __GFP_NORETRY);
+ submit = kmalloc(sz, GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY);
if (!submit)
return NULL;
diff --git a/drivers/gpu/drm/selftests/test-drm_mm.c b/drivers/gpu/drm/selftests/test-drm_mm.c
index dfdd858eda0a..86eb4c185a28 100644
--- a/drivers/gpu/drm/selftests/test-drm_mm.c
+++ b/drivers/gpu/drm/selftests/test-drm_mm.c
@@ -1627,7 +1627,7 @@ static int igt_topdown(void *ignored)
goto err;
bitmap = kzalloc(count / BITS_PER_LONG * sizeof(unsigned long),
- GFP_TEMPORARY);
+ GFP_KERNEL);
if (!bitmap)
goto err_nodes;
@@ -1741,7 +1741,7 @@ static int igt_bottomup(void *ignored)
goto err;
bitmap = kzalloc(count / BITS_PER_LONG * sizeof(unsigned long),
- GFP_TEMPORARY);
+ GFP_KERNEL);
if (!bitmap)
goto err_nodes;
diff --git a/drivers/misc/cxl/pci.c b/drivers/misc/cxl/pci.c
index d18b3d9292fd..3ba04f371380 100644
--- a/drivers/misc/cxl/pci.c
+++ b/drivers/misc/cxl/pci.c
@@ -1279,7 +1279,7 @@ ssize_t cxl_pci_afu_read_err_buffer(struct cxl_afu *afu, char *buf,
}
/* use bounce buffer for copy */
- tbuf = (void *)__get_free_page(GFP_TEMPORARY);
+ tbuf = (void *)__get_free_page(GFP_KERNEL);
if (!tbuf)
return -ENOMEM;
diff --git a/drivers/xen/gntalloc.c b/drivers/xen/gntalloc.c
index 1bf55a32a4b3..3fa40c723e8e 100644
--- a/drivers/xen/gntalloc.c
+++ b/drivers/xen/gntalloc.c
@@ -294,7 +294,7 @@ static long gntalloc_ioctl_alloc(struct gntalloc_file_private_data *priv,
goto out;
}
- gref_ids = kcalloc(op.count, sizeof(gref_ids[0]), GFP_TEMPORARY);
+ gref_ids = kcalloc(op.count, sizeof(gref_ids[0]), GFP_KERNEL);
if (!gref_ids) {
rc = -ENOMEM;
goto out;

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