linux-kernel - [PATCHv2 00/11] dmapool enhancements

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Date:   Fri, 16 Dec 2022 12:16:14 -0800
From:   Keith Busch <kbusch@...a.com>
To:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        Matthew Wilcox <willy@...radead.org>
CC:     Tony Battersby <tonyb@...ernetics.com>,
        Kernel Team <kernel-team@...a.com>,
        Keith Busch <kbusch@...nel.org>
Subject: [PATCHv2 00/11] dmapool enhancements

From: Keith Busch <kbusch@...nel.org>

The time spent in dma_pool alloc/free goes up linearly as the number of
pages backing the pool increases. We can reduce this to constant time
with some minor changes to how free pages are tracked.

Changes since previous version:

  Fixed dmapool_test to use appropriate dma_op accessors

  Fixed up comment in dmapool about the data structures

  Fixed dma pool boundary checks when initializing the pool

  And since I mess up the boundary checks for odd alignment, I updated
  dmapool_test allow setting arbitrary alignment and boundary to catch
  the same case that failed in the previous version, reported here:

   https://lore.kernel.org/oe-lkp/202212112301.ad0819f7-oliver.sang@intel.com/

Keith Busch (7):
  dmapool: add alloc/free performance test
  dmapool: move debug code to own functions
  dmapool: rearrange page alloc failure handling
  dmapool: consolidate page initialization
  dmapool: simplify freeing
  dmapool: don't memset on free twice
  dmapool: link blocks across pages

Tony Battersby (4):
  dmapool: remove checks for dev == NULL
  dmapool: use sysfs_emit() instead of scnprintf()
  dmapool: cleanup integer types
  dmapool: speedup DMAPOOL_DEBUG with init_on_alloc

 mm/Kconfig        |   9 ++
 mm/Makefile       |   1 +
 mm/dmapool.c      | 356 ++++++++++++++++++++++------------------------
 mm/dmapool_test.c | 146 +++++++++++++++++++
 4 files changed, 324 insertions(+), 188 deletions(-)
 create mode 100644 mm/dmapool_test.c

-- 
2.30.2