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WSL2-Linux-Kernel
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[PATCH] mm: use __GFP_NOMEMALLOC 

Use the new __GFP_NOMEMALLOC to simplify the previous handling of
PF_MEMALLOC.

Signed-off-by: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Nick Piggin 2005-05-01 08:58:37 -07:00 коммит произвёл Linus Torvalds
Родитель 20a77776c2
Коммит bd53b714d3
2 изменённых файлов: 13 добавлений и 33 удалений
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19
drivers/md/dm-crypt.c
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@ -331,25 +331,19 @@ crypt_alloc_buffer(struct crypt_config *cc, unsigned int size,
struct bio *bio;
unsigned int nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
int gfp_mask = GFP_NOIO | __GFP_HIGHMEM;
unsigned long flags = current->flags;
unsigned int i;
/*
* Tell VM to act less aggressively and fail earlier.
* This is not necessary but increases throughput.
* Use __GFP_NOMEMALLOC to tell the VM to act less aggressively and
* to fail earlier. This is not necessary but increases throughput.
* FIXME: Is this really intelligent?
*/
current->flags &= ~PF_MEMALLOC;
if (base_bio)
bio = bio_clone(base_bio, GFP_NOIO);
bio = bio_clone(base_bio, GFP_NOIO|__GFP_NOMEMALLOC);
else
bio = bio_alloc(GFP_NOIO, nr_iovecs);
if (!bio) {
if (flags & PF_MEMALLOC)
current->flags |= PF_MEMALLOC;
bio = bio_alloc(GFP_NOIO|__GFP_NOMEMALLOC, nr_iovecs);
if (!bio)
return NULL;
}
/* if the last bio was not complete, continue where that one ended */
bio->bi_idx = *bio_vec_idx;
@ -386,9 +380,6 @@ crypt_alloc_buffer(struct crypt_config *cc, unsigned int size,
size -= bv->bv_len;
}
if (flags & PF_MEMALLOC)
current->flags |= PF_MEMALLOC;
if (!bio->bi_size) {
bio_put(bio);
return NULL;

27
mm/swap_state.c
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@ -143,7 +143,6 @@ void __delete_from_swap_cache(struct page *page)
int add_to_swap(struct page * page)
{
swp_entry_t entry;
int pf_flags;
int err;
if (!PageLocked(page))
@ -154,29 +153,19 @@ int add_to_swap(struct page * page)
if (!entry.val)
return 0;
/* Radix-tree node allocations are performing
* GFP_ATOMIC allocations under PF_MEMALLOC.
* They can completely exhaust the page allocator.
/*
* Radix-tree node allocations from PF_MEMALLOC contexts could
* completely exhaust the page allocator. __GFP_NOMEMALLOC
* stops emergency reserves from being allocated.
*
* So PF_MEMALLOC is dropped here. This causes the slab
* allocations to fail earlier, so radix-tree nodes will
* then be allocated from the mempool reserves.
*
* We're still using __GFP_HIGH for radix-tree node
* allocations, so some of the emergency pools are available,
* just not all of them.
* TODO: this could cause a theoretical memory reclaim
* deadlock in the swap out path.
*/
pf_flags = current->flags;
current->flags &= ~PF_MEMALLOC;
/*
* Add it to the swap cache and mark it dirty
*/
err = __add_to_swap_cache(page, entry, GFP_ATOMIC|__GFP_NOWARN);
if (pf_flags & PF_MEMALLOC)
current->flags |= PF_MEMALLOC;
err = __add_to_swap_cache(page, entry,
GFP_ATOMIC|__GFP_NOMEMALLOC|__GFP_NOWARN);
switch (err) {
case 0: /* Success */