mempool: optimize mempool resizing#1009
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Resizing mempool to a bigger size currently requires a new allocation and a data copy to a new larger elements array which doesn't go well with the idea of having a fast and deadlock free memory allocations during exreme VM load. This patch introduces a new parameter max_nr for a part of the mempool API, which denotes the maximum size of the pool. With it in place we can avoid any allocations in mempool_resize() since we can either grant the resizing request or reject it basing on thr maximum allowed size of the elements array. For those few users of the mempool API that actually use mempool_resize() it is a clear upgrade because the maximum number of elements is known upfront. Derivative APIs (like mempool_init_kmalloc_pool()) are mostly left intact, substituted by the new mempool_init_kmalloc_resizable_pool() API where the pool is actually meant to be resizable. Signed-off-by: Vitaly Vul <vitaly.vul@partner.samsung.com>
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Pull request for series with
subject: mempool: optimize mempool resizing
version: 1
url: https://patchwork.kernel.org/project/linux-block/list/?series=1116713