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Revert "Disable vmalloc() direct reclaim"

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This reverts commit 2092cf68d8.  The
use of the PF_MEMALLOC flag was always a hack to work around memory
reclaim deadlocks.  Those issues are believed to be resolved so this
workaround can be safely reverted.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
This commit is contained in:
Brian Behlendorf 2012-08-18 11:06:21 -07:00
parent 617f79de6a
commit 500e95c884
1 changed files with 2 additions and 22 deletions
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24
module/spl/spl-kmem.c
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@ -840,31 +840,11 @@ kv_alloc(spl_kmem_cache_t *skc, int size, int flags)
ASSERT(ISP2(size));
if (skc->skc_flags & KMC_KMEM) {
if (skc->skc_flags & KMC_KMEM)
ptr = (void *)__get_free_pages(flags, get_order(size));
} else {
/*
* As part of vmalloc() an __pte_alloc_kernel() allocation
* may occur. This internal allocation does not honor the
* gfp flags passed to vmalloc(). This means even when
* vmalloc(GFP_NOFS) is called it is possible synchronous
* reclaim will occur. This reclaim can trigger file IO
* which can result in a deadlock. This issue can be avoided
* by explicitly setting PF_MEMALLOC on the process to
* subvert synchronous reclaim. The following bug has
* been filed at kernel.org to track the issue.
*
* https://bugzilla.kernel.org/show_bug.cgi?id=30702
*/
if (!(flags & __GFP_FS))
current->flags |= PF_MEMALLOC;
else
ptr = __vmalloc(size, flags | __GFP_HIGHMEM, PAGE_KERNEL);
if (!(flags & __GFP_FS))
current->flags &= ~PF_MEMALLOC;
}
/* Resulting allocated memory will be page aligned */
ASSERT(IS_P2ALIGNED(ptr, PAGE_SIZE));