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2092cf68d8
As part of vmalloc() a __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 that a 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 when vmalloc() is called with !__GFP_FS. An example stack of the deadlock can be found here (1), along with the upstream kernel bug (2), and the original bug discussion on the linux-mm mailing list (3). This code can be properly autoconf'ed when the upstream bug is fixed. 1) http://github.com/behlendorf/zfs/issues/labels/Vmalloc#issue/133 2) http://bugzilla.kernel.org/show_bug.cgi?id=30702 3) http://marc.info/?l=linux-mm&m=128942194520631&w=4 |
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| .. | ||
| .gitignore | ||
| Makefile.in | ||
| spl-atomic.c | ||
| spl-condvar.c | ||
| spl-cred.c | ||
| spl-debug.c | ||
| spl-err.c | ||
| spl-generic.c | ||
| spl-kmem.c | ||
| spl-kobj.c | ||
| spl-kstat.c | ||
| spl-module.c | ||
| spl-mutex.c | ||
| spl-proc.c | ||
| spl-rwlock.c | ||
| spl-taskq.c | ||
| spl-thread.c | ||
| spl-time.c | ||
| spl-tsd.c | ||
| spl-vnode.c | ||
| spl-xdr.c | ||
| spl-zlib.c | ||