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Don't call kmem_cache_shrink from shrinker #487
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Linux slab will automatically free empty slab when number of partial slab is over min_partial, so we don't need to explicitly shrink it. In fact, calling kmem_cache_shrink from shrinker will cause heavy contention on kmem_cache_node->list_lock, to the point that it might cause __slab_free to livelock (see openzfs/zfs#3936) Signed-off-by: Chunwei Chen <david.chen@osnexus.com>
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LGTM, nice fix. Merged. 3e7e6f3 Don't call kmem_cache_shrink from shrinker |
ryao
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Dec 3, 2015
Linux slab will automatically free empty slab when number of partial slab is over min_partial, so we don't need to explicitly shrink it. In fact, calling kmem_cache_shrink from shrinker will cause heavy contention on kmem_cache_node->list_lock, to the point that it might cause __slab_free to livelock (see openzfs/zfs#3936) Signed-off-by: Chunwei Chen <david.chen@osnexus.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes openzfs/zfs#3936 Closes openzfs#487
tuxoko
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Dec 14, 2015
Linux slab will automatically free empty slab when number of partial slab is over min_partial, so we don't need to explicitly shrink it. In fact, calling kmem_cache_shrink from shrinker will cause heavy contention on kmem_cache_node->list_lock, to the point that it might cause __slab_free to livelock (see openzfs/zfs#3936) Signed-off-by: Chunwei Chen <david.chen@osnexus.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes openzfs/zfs#3936 Closes openzfs#487
tuxoko
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Jan 12, 2016
Linux slab will automatically free empty slab when number of partial slab is over min_partial, so we don't need to explicitly shrink it. In fact, calling kmem_cache_shrink from shrinker will cause heavy contention on kmem_cache_node->list_lock, to the point that it might cause __slab_free to livelock (see openzfs/zfs#3936) Signed-off-by: Chunwei Chen <david.chen@osnexus.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes openzfs/zfs#3936 Closes openzfs#487
behlendorf
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Jan 13, 2016
Linux slab will automatically free empty slab when number of partial slab is over min_partial, so we don't need to explicitly shrink it. In fact, calling kmem_cache_shrink from shrinker will cause heavy contention on kmem_cache_node->list_lock, to the point that it might cause __slab_free to livelock (see openzfs/zfs#3936) Signed-off-by: Chunwei Chen <david.chen@osnexus.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes openzfs/zfs#3936 Closes #487
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Linux slab will automatically free empty slab when number of partial slab is
over min_partial, so we don't need to explicitly shrink it. In fact, calling
kmem_cache_shrink from shrinker will cause heavy contention on
kmem_cache_node->list_lock, to the point that it might cause __slab_free to
livelock (see openzfs/zfs#3936)
Signed-off-by: Chunwei Chen david.chen@osnexus.com