Messages in this thread | | | From | John Garry <> | Subject | [PATCH v4 0/3] iommu/iova: Solve longterm IOVA issue | Date | Thu, 10 Dec 2020 02:23:06 +0800 |
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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
Differences to v3: - Drop Cong's patch, already accepted - Add tags - Rebased
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/
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 | 58 ++++++++++++++++++++++++-------------------- 1 file changed, 32 insertions(+), 26 deletions(-)
-- 2.26.2
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