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Date: Fri, 21 Mar 2008 10:27:07 -0700
From: "Kok, Auke" <auke-jan.h.kok@...el.com>
To: Christoph Lameter <clameter@....com>
CC: linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [12/14] vcompound: Avoid vmalloc in e1000 driver
Christoph Lameter wrote:
> Switch all the uses of vmalloc in the e1000 driver to virtual compounds.
> This will result in the use of regular memory for the ring buffers etc
> avoiding page tables,
hey, cool patch for sure!
I'll see if I can transpose this to e1000e and all the other drivers I maintain
which use vmalloc as well.
This one goes on my queue and I'll merge through Jeff.
Thanks Christoph!
Auke
> Signed-off-by: Christoph Lameter <clameter@....com>
>
> ---
> drivers/net/e1000/e1000_main.c | 23 +++++++++++------------
> drivers/net/e1000e/netdev.c | 12 ++++++------
> 2 files changed, 17 insertions(+), 18 deletions(-)
>
> Index: linux-2.6.25-rc5-mm1/drivers/net/e1000e/netdev.c
> ===================================================================
> --- linux-2.6.25-rc5-mm1.orig/drivers/net/e1000e/netdev.c 2008-03-20 21:52:45.962733927 -0700
> +++ linux-2.6.25-rc5-mm1/drivers/net/e1000e/netdev.c 2008-03-20 21:57:27.212078371 -0700
> @@ -1083,7 +1083,7 @@ int e1000e_setup_tx_resources(struct e10
> int err = -ENOMEM, size;
>
> size = sizeof(struct e1000_buffer) * tx_ring->count;
> - tx_ring->buffer_info = vmalloc(size);
> + tx_ring->buffer_info = __alloc_vcompound(GFP_KERNEL, get_order(size));
> if (!tx_ring->buffer_info)
> goto err;
> memset(tx_ring->buffer_info, 0, size);
> @@ -1102,7 +1102,7 @@ int e1000e_setup_tx_resources(struct e10
>
> return 0;
> err:
> - vfree(tx_ring->buffer_info);
> + __free_vcompound(tx_ring->buffer_info);
> ndev_err(adapter->netdev,
> "Unable to allocate memory for the transmit descriptor ring\n");
> return err;
> @@ -1121,7 +1121,7 @@ int e1000e_setup_rx_resources(struct e10
> int i, size, desc_len, err = -ENOMEM;
>
> size = sizeof(struct e1000_buffer) * rx_ring->count;
> - rx_ring->buffer_info = vmalloc(size);
> + rx_ring->buffer_info = __alloc_vcompound(GFP_KERNEL, get_order(size));
> if (!rx_ring->buffer_info)
> goto err;
> memset(rx_ring->buffer_info, 0, size);
> @@ -1157,7 +1157,7 @@ err_pages:
> kfree(buffer_info->ps_pages);
> }
> err:
> - vfree(rx_ring->buffer_info);
> + __free_vcompound(rx_ring->buffer_info);
> ndev_err(adapter->netdev,
> "Unable to allocate memory for the transmit descriptor ring\n");
> return err;
> @@ -1204,7 +1204,7 @@ void e1000e_free_tx_resources(struct e10
>
> e1000_clean_tx_ring(adapter);
>
> - vfree(tx_ring->buffer_info);
> + __free_vcompound(tx_ring->buffer_info);
> tx_ring->buffer_info = NULL;
>
> dma_free_coherent(&pdev->dev, tx_ring->size, tx_ring->desc,
> @@ -1231,7 +1231,7 @@ void e1000e_free_rx_resources(struct e10
> kfree(rx_ring->buffer_info[i].ps_pages);
> }
>
> - vfree(rx_ring->buffer_info);
> + __free_vcompound(rx_ring->buffer_info);
> rx_ring->buffer_info = NULL;
>
> dma_free_coherent(&pdev->dev, rx_ring->size, rx_ring->desc,
> Index: linux-2.6.25-rc5-mm1/drivers/net/e1000/e1000_main.c
> ===================================================================
> --- linux-2.6.25-rc5-mm1.orig/drivers/net/e1000/e1000_main.c 2008-03-20 22:06:14.462252441 -0700
> +++ linux-2.6.25-rc5-mm1/drivers/net/e1000/e1000_main.c 2008-03-20 22:08:46.582009872 -0700
> @@ -1609,14 +1609,13 @@ e1000_setup_tx_resources(struct e1000_ad
> int size;
>
> size = sizeof(struct e1000_buffer) * txdr->count;
> - txdr->buffer_info = vmalloc(size);
> + txdr->buffer_info = __alloc_vcompound(GFP_KERNEL | __GFP_ZERO,
> + get_order(size));
> if (!txdr->buffer_info) {
> DPRINTK(PROBE, ERR,
> "Unable to allocate memory for the transmit descriptor ring\n");
> return -ENOMEM;
> }
> - memset(txdr->buffer_info, 0, size);
> -
> /* round up to nearest 4K */
>
> txdr->size = txdr->count * sizeof(struct e1000_tx_desc);
> @@ -1625,7 +1624,7 @@ e1000_setup_tx_resources(struct e1000_ad
> txdr->desc = pci_alloc_consistent(pdev, txdr->size, &txdr->dma);
> if (!txdr->desc) {
> setup_tx_desc_die:
> - vfree(txdr->buffer_info);
> + __free_vcompound(txdr->buffer_info);
> DPRINTK(PROBE, ERR,
> "Unable to allocate memory for the transmit descriptor ring\n");
> return -ENOMEM;
> @@ -1653,7 +1652,7 @@ setup_tx_desc_die:
> DPRINTK(PROBE, ERR,
> "Unable to allocate aligned memory "
> "for the transmit descriptor ring\n");
> - vfree(txdr->buffer_info);
> + __free_vcompound(txdr->buffer_info);
> return -ENOMEM;
> } else {
> /* Free old allocation, new allocation was successful */
> @@ -1826,7 +1825,7 @@ e1000_setup_rx_resources(struct e1000_ad
> int size, desc_len;
>
> size = sizeof(struct e1000_buffer) * rxdr->count;
> - rxdr->buffer_info = vmalloc(size);
> + rxdr->buffer_info = __alloc_vcompound(GFP_KERNEL, size);
> if (!rxdr->buffer_info) {
> DPRINTK(PROBE, ERR,
> "Unable to allocate memory for the receive descriptor ring\n");
> @@ -1837,7 +1836,7 @@ e1000_setup_rx_resources(struct e1000_ad
> rxdr->ps_page = kcalloc(rxdr->count, sizeof(struct e1000_ps_page),
> GFP_KERNEL);
> if (!rxdr->ps_page) {
> - vfree(rxdr->buffer_info);
> + __free_vcompound(rxdr->buffer_info);
> DPRINTK(PROBE, ERR,
> "Unable to allocate memory for the receive descriptor ring\n");
> return -ENOMEM;
> @@ -1847,7 +1846,7 @@ e1000_setup_rx_resources(struct e1000_ad
> sizeof(struct e1000_ps_page_dma),
> GFP_KERNEL);
> if (!rxdr->ps_page_dma) {
> - vfree(rxdr->buffer_info);
> + __free_vcompound(rxdr->buffer_info);
> kfree(rxdr->ps_page);
> DPRINTK(PROBE, ERR,
> "Unable to allocate memory for the receive descriptor ring\n");
> @@ -1870,7 +1869,7 @@ e1000_setup_rx_resources(struct e1000_ad
> DPRINTK(PROBE, ERR,
> "Unable to allocate memory for the receive descriptor ring\n");
> setup_rx_desc_die:
> - vfree(rxdr->buffer_info);
> + __free_vcompound(rxdr->buffer_info);
> kfree(rxdr->ps_page);
> kfree(rxdr->ps_page_dma);
> return -ENOMEM;
> @@ -2175,7 +2174,7 @@ e1000_free_tx_resources(struct e1000_ada
>
> e1000_clean_tx_ring(adapter, tx_ring);
>
> - vfree(tx_ring->buffer_info);
> + __free_vcompound(tx_ring->buffer_info);
> tx_ring->buffer_info = NULL;
>
> pci_free_consistent(pdev, tx_ring->size, tx_ring->desc, tx_ring->dma);
> @@ -2283,9 +2282,9 @@ e1000_free_rx_resources(struct e1000_ada
>
> e1000_clean_rx_ring(adapter, rx_ring);
>
> - vfree(rx_ring->buffer_info);
> + __free_vcompound(rx_ring->buffer_info);
> rx_ring->buffer_info = NULL;
> - kfree(rx_ring->ps_page);
> + __free_vcompound(rx_ring->ps_page);
> rx_ring->ps_page = NULL;
> kfree(rx_ring->ps_page_dma);
> rx_ring->ps_page_dma = NULL;
>
--
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