Messages in this thread | | | From | KOSAKI Motohiro <> | Date | Wed, 11 Jan 2012 02:25:26 -0500 | Subject | Re: [PATCH -mm 2/2] mm: kswapd carefully invoke compaction |
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> With CONFIG_COMPACTION enabled, kswapd does not try to free > contiguous free pages, even when it is woken for a higher order > request. > > This could be bad for eg. jumbo frame network allocations, which > are done from interrupt context and cannot compact memory themselves. > Higher than before allocation failure rates in the network receive > path have been observed in kernels with compaction enabled. > > Teach kswapd to defragment the memory zones in a node, but only > if required and compaction is not deferred in a zone. > > Signed-off-by: Rik van Riel <riel@redhat.com>
I agree with we need asynchronous defragmentations feature. But, do we really need to use kswapd for compaction? While kswapd take a compaction work, it can't work to make free memory.
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