From: John Garry <john.garry@huawei.com>
To: <robin.murphy@arm.com>, <joro@8bytes.org>
Cc: linuxarm@huawei.com, linux-kernel@vger.kernel.org,
iommu@lists.linux-foundation.org, xiyou.wangcong@gmail.com
Subject: [PATCH v3 0/4] iommu/iova: Solve longterm IOVA issue
Date: Thu, 12 Nov 2020 19:28:25 +0800 [thread overview]
Message-ID: <1605180509-9183-1-git-send-email-john.garry@huawei.com> (raw)
This series contains a patch to solve the longterm IOVA issue which
leizhen originally tried to address at [0].
A sieved kernel log is at the following, showing periodic dumps of IOVA
sizes, per CPU and per depot bin, per IOVA size granule:
https://raw.githubusercontent.com/hisilicon/kernel-dev/topic-iommu-5.10-iova-debug-v3/aging_test
Notice, for example, the following logs:
[13175.355584] print_iova1 cpu_total=40135 depot_total=3866 total=44001
[83483.457858] print_iova1 cpu_total=62532 depot_total=24476 total=87008
Where total IOVA rcache size has grown from 44K->87K over a long time.
Along with this patch, I included the following:
- A smaller helper to clear all IOVAs for a domain
- Change polarity of the IOVA magazine helpers
- Small optimisation from Cong Wang included, which was never applied [1].
There was some debate of the other patches in that series, but this one
is quite straightforward.
Differnces to v2:
- Update commit message for patch 3/4
Differences to v1:
- Add IOVA clearing helper
- Add patch to change polarity of mag helpers
- Avoid logically-redundant extra variable in __iova_rcache_insert()
[0] https://lore.kernel.org/linux-iommu/20190815121104.29140-3-thunder.leizhen@huawei.com/
[1] https://lore.kernel.org/linux-iommu/4b74d40a-22d1-af53-fcb6-5d70183705a8@huawei.com/
Cong Wang (1):
iommu: avoid taking iova_rbtree_lock twice
John Garry (3):
iommu/iova: Add free_all_cpu_cached_iovas()
iommu/iova: Avoid double-negatives in magazine helpers
iommu/iova: Flush CPU rcache for when a depot fills
drivers/iommu/iova.c | 66 +++++++++++++++++++++++++-------------------
1 file changed, 38 insertions(+), 28 deletions(-)
--
2.26.2
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next reply other threads:[~2020-11-12 11:32 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-12 11:28 John Garry [this message]
2020-11-12 11:28 ` [PATCH v3 1/4] iommu/iova: Add free_all_cpu_cached_iovas() John Garry
2020-11-12 11:28 ` [PATCH v3 2/4] iommu/iova: Avoid double-negatives in magazine helpers John Garry
2020-11-12 11:28 ` [PATCH v3 3/4] iommu/iova: Flush CPU rcache for when a depot fills John Garry
2020-11-12 11:28 ` [PATCH v3 4/4] iommu: avoid taking iova_rbtree_lock twice John Garry
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