Commit 4cf0b354 authored Aug 12, 2016 by Florian Westphal Committed by David S. Miller Aug 14, 2016

rhashtable: avoid large lock-array allocations



Sander reports following splat after netfilter nat bysrc table got
converted to rhashtable:

swapper/0: page allocation failure: order:3, mode:0x2084020(GFP_ATOMIC|__GFP_COMP)
 CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.8.0-rc1 [..]
 [<ffffffff811633ed>] warn_alloc_failed+0xdd/0x140
 [<ffffffff811638b1>] __alloc_pages_nodemask+0x3e1/0xcf0
 [<ffffffff811a72ed>] alloc_pages_current+0x8d/0x110
 [<ffffffff8117cb7f>] kmalloc_order+0x1f/0x70
 [<ffffffff811aec19>] __kmalloc+0x129/0x140
 [<ffffffff8146d561>] bucket_table_alloc+0xc1/0x1d0
 [<ffffffff8146da1d>] rhashtable_insert_rehash+0x5d/0xe0
 [<ffffffff819fcfff>] nf_nat_setup_info+0x2ef/0x400

The failure happens when allocating the spinlock array.
Even with GFP_KERNEL its unlikely for such a large allocation
to succeed.

Thomas Graf pointed me at inet_ehash_locks_alloc(), so in addition
to adding NOWARN for atomic allocations this also makes the bucket-array
sizing more conservative.

In commit 095dc8e0 ("tcp: fix/cleanup inet_ehash_locks_alloc()"),
Eric Dumazet says: "Budget 2 cache lines per cpu worth of 'spinlocks'".
IOW, consider size needed by a single spinlock when determining
number of locks per cpu.  So with 64 byte per cacheline and 4 byte per
spinlock this gives 32 locks per cpu.

Resulting size of the lock-array (sizeof(spinlock) == 4):

cpus:    1   2   4   8   16   32   64
old:    1k  1k  4k  8k  16k  16k  16k
new:   128 256 512  1k   2k   4k   8k

8k allocation should have decent chance of success even
with GFP_ATOMIC, and should not fail with GFP_KERNEL.

With 72-byte spinlock (LOCKDEP):
cpus :   1   2
old:    9k 18k
new:   ~2k ~4k

Reported-by: Sander Eikelenboom <linux@eikelenboom.it>
Suggested-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 952fcfd0

lib/rhashtable.c

+5 −2

Original line number	Diff line number	Diff line
		@@ -30,7 +30,7 @@

		#define HASH_DEFAULT_SIZE 64UL
		#define HASH_MIN_SIZE 4U
		#define BUCKET_LOCKS_PER_CPU 128UL
		#define BUCKET_LOCKS_PER_CPU 32UL

		static u32 head_hashfn(struct rhashtable *ht,
		const struct bucket_table *tbl,
		@@ -70,7 +70,7 @@ static int alloc_bucket_locks(struct rhashtable ht, struct bucket_table tbl,
		unsigned int nr_pcpus = num_possible_cpus();
		#endif

		nr_pcpus = min_t(unsigned int, nr_pcpus, 32UL);
		nr_pcpus = min_t(unsigned int, nr_pcpus, 64UL);
		size = roundup_pow_of_two(nr_pcpus * ht->p.locks_mul);

		/* Never allocate more than 0.5 locks per bucket */
		@@ -83,6 +83,9 @@ static int alloc_bucket_locks(struct rhashtable ht, struct bucket_table tbl,
		tbl->locks = vmalloc(size * sizeof(spinlock_t));
		else
		#endif
		if (gfp != GFP_KERNEL)
		gfp \|= __GFP_NOWARN \| __GFP_NORETRY;

		tbl->locks = kmalloc_array(size, sizeof(spinlock_t),
		gfp);
		if (!tbl->locks)

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