Am 04.12.19 um 17:08 schrieb Deucher, Alexander:
-Original Message-
From: Deucher, Alexander
Sent: Monday, December 2, 2019 11:37 AM
To: Lucas Stach ; Kai-Heng Feng
; j...@8bytes.org; Koenig, Christian
(christian.koe...@amd.com)
Cc: iommu@lists.linux-foundation.org; linux-ker...@vger.ker
Hi, Christoph.
On Wed, 2019-12-04 at 14:03 +0100, Christoph Hellwig wrote:
> Devices that are forced to DMA through swiotlb need to be treated as
> if
> they are addressing limited.
>
> Signed-off-by: Christoph Hellwig
> ---
> include/linux/dma-direct.h | 1 +
> kernel/dma/direct.c| 8
If the magazine is empty, iova_magazine_free_pfns() should
be a nop, however it misses the case of mag->size==0. So we
should just call iova_magazine_empty().
This should reduce the contention on iovad->iova_rbtree_lock
a little bit, not much at all.
Cc: Joerg Roedel
Cc: John Garry
Signed-off-b
The IOVA cache algorithm implemented in IOMMU code does not
exactly match the original algorithm described in the paper
"Magazines and Vmem: Extending the Slab Allocator to Many
CPUs and Arbitrary Resources".
Particularly, it doesn't need to free the loaded empty magazine
when trying to put it bac
Both find_iova() and __free_iova() take iova_rbtree_lock,
there is no reason to take and release it twice inside
free_iova().
Fold them into one critical section by calling the unlock
versions instead.
Cc: Joerg Roedel
Cc: John Garry
Signed-off-by: Cong Wang
---
drivers/iommu/iova.c | 8 +
This patchset contains three small optimizations for the global spinlock
contention in IOVA cache. Our memcache perf test shows this reduced its
p999 latency down by 45% on AMD when IOMMU is enabled.
Cong Wang (3):
iommu: avoid unnecessary magazine allocations
iommu: optimize iova_magazine_fre
> On Dec 6, 2019, at 4:38 PM, Cong Wang wrote:
>
> This patchset contains three small optimizations for the global spinlock
> contention in IOVA cache. Our memcache perf test shows this reduced its
> p999 latency down by 45% on AMD when IOMMU is enabled.
Can you at least have a changelog comp
Hi Jerry,
On 12/6/19 3:24 PM, Jerry Snitselaar wrote:
On Fri Dec 06 19, Lu Baolu wrote:
[snip]
Can you please try below change? Let's check whether the afending
address has been mapped for device 01.00.2.
$ git diff
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index db7bfd4f2d20
On Sat Dec 07 19, Lu Baolu wrote:
Hi Jerry,
On 12/6/19 3:24 PM, Jerry Snitselaar wrote:
On Fri Dec 06 19, Lu Baolu wrote:
[snip]
Can you please try below change? Let's check whether the afending
address has been mapped for device 01.00.2.
$ git diff
diff --git a/drivers/iommu/iommu.c b/drive
On Fri Dec 06 19, Jerry Snitselaar wrote:
On Sat Dec 07 19, Lu Baolu wrote:
Hi Jerry,
On 12/6/19 3:24 PM, Jerry Snitselaar wrote:
On Fri Dec 06 19, Lu Baolu wrote:
[snip]
Can you please try below change? Let's check whether the afending
address has been mapped for device 01.00.2.
$ git diff
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