From: Matthew Wilcox <willy@infradead.org>
To: Tony Battersby <tonyb@cybernetics.com>
Cc: Christoph Hellwig <hch@lst.de>,
Marek Szyprowski <m.szyprowski@samsung.com>,
iommu@lists.linux-foundation.org, linux-mm@kvack.org,
"linux-scsi@vger.kernel.org" <linux-scsi@vger.kernel.org>
Subject: Re: [PATCH v4 4/9] dmapool: improve scalability of dma_pool_alloc
Date: Mon, 12 Nov 2018 22:19:17 -0800 [thread overview]
Message-ID: <20181113061917.GO21824@bombadil.infradead.org> (raw)
In-Reply-To: <e982cd38-a721-bd06-8da8-0d6a0480685c@cybernetics.com>
On Mon, Nov 12, 2018 at 10:43:25AM -0500, Tony Battersby wrote:
> dma_pool_alloc() scales poorly when allocating a large number of pages
> because it does a linear scan of all previously-allocated pages before
> allocating a new one. Improve its scalability by maintaining a separate
> list of pages that have free blocks ready to (re)allocate. In big O
> notation, this improves the algorithm from O(n^2) to O(n).
>
> Signed-off-by: Tony Battersby <tonyb@cybernetics.com>
Acked-by: Matthew Wilcox <willy@infradead.org>
prev parent reply other threads:[~2018-11-13 6:19 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-12 15:43 Tony Battersby
2018-11-13 6:19 ` Matthew Wilcox [this message]
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