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| author | Dan Williams <dan.j.williams@intel.com> | 2009-09-08 17:53:04 -0700 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2009-09-08 17:53:04 -0700 |
| commit | 162b96e63e518aa6ff029ce23de12d7f027483bf (patch) | |
| tree | 532191d0cef7cf975b70a07b1c69a293d6f552f7 /drivers/dma/ioat/dma_v2.c | |
| parent | 0803172778901e24a75ab074798d98c2b7411559 (diff) | |
| download | kernel_samsung_smdk4412-162b96e63e518aa6ff029ce23de12d7f027483bf.zip kernel_samsung_smdk4412-162b96e63e518aa6ff029ce23de12d7f027483bf.tar.gz kernel_samsung_smdk4412-162b96e63e518aa6ff029ce23de12d7f027483bf.tar.bz2 | |
ioat2,3: cacheline align software descriptor allocations
All the necessary fields for handling an ioat2,3 ring entry can fit into
one cacheline. Move ->len prior to ->txd in struct ioat_ring_ent, and
move allocation of these entries to a hw-cache-aligned kmem cache to
reduce the number of cachelines dirtied for descriptor management.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/dma/ioat/dma_v2.c')
| -rw-r--r-- | drivers/dma/ioat/dma_v2.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/dma/ioat/dma_v2.c b/drivers/dma/ioat/dma_v2.c index 460b773..fa3d6db 100644 --- a/drivers/dma/ioat/dma_v2.c +++ b/drivers/dma/ioat/dma_v2.c @@ -399,11 +399,12 @@ static struct ioat_ring_ent *ioat2_alloc_ring_ent(struct dma_chan *chan, gfp_t f return NULL; memset(hw, 0, sizeof(*hw)); - desc = kzalloc(sizeof(*desc), flags); + desc = kmem_cache_alloc(ioat2_cache, flags); if (!desc) { pci_pool_free(dma->dma_pool, hw, phys); return NULL; } + memset(desc, 0, sizeof(*desc)); dma_async_tx_descriptor_init(&desc->txd, chan); desc->txd.tx_submit = ioat2_tx_submit_unlock; @@ -418,7 +419,7 @@ static void ioat2_free_ring_ent(struct ioat_ring_ent *desc, struct dma_chan *cha dma = to_ioatdma_device(chan->device); pci_pool_free(dma->dma_pool, desc->hw, desc->txd.phys); - kfree(desc); + kmem_cache_free(ioat2_cache, desc); } static struct ioat_ring_ent **ioat2_alloc_ring(struct dma_chan *c, int order, gfp_t flags) |