On Thu, May 24, 2018 at 1:22 AM, Qing Huang <qing.huang@xxxxxxxxxx> wrote:
> When a system is under memory presure (high usage with fragments),
> the original 256KB ICM chunk allocations will likely trigger kernel
> memory management to enter slow path doing memory compact/migration
> ops in order to complete high order memory allocations.
>
> When that happens, user processes calling uverb APIs may get stuck
> for more than 120s easily even though there are a lot of free pages
> in smaller chunks available in the system.
>
> Syslog:
> ...
> Dec 10 09:04:51 slcc03db02 kernel: [397078.572732] INFO: task
> oracle_205573_e:205573 blocked for more than 120 seconds.
> ...
>
> With 4KB ICM chunk size on x86_64 arch, the above issue is fixed.
>
> However in order to support smaller ICM chunk size, we need to fix
> another issue in large size kcalloc allocations.
>
> E.g.
> Setting log_num_mtt=30 requires 1G mtt entries. With the 4KB ICM chunk
> size, each ICM chunk can only hold 512 mtt entries (8 bytes for each mtt
> entry). So we need a 16MB allocation for a table->icm pointer array to
> hold 2M pointers which can easily cause kcalloc to fail.
>
> The solution is to use kvzalloc to replace kcalloc which will fall back
> to vmalloc automatically if kmalloc fails.
Hi,
Could you please write why it first try to allocate the contiguous pages?
I think it is necessary to comment why it uses kvzalloc instead of vzalloc.
>
> Signed-off-by: Qing Huang <qing.huang@xxxxxxxxxx>
> Acked-by: Daniel Jurgens <danielj@xxxxxxxxxxxx>
> Reviewed-by: Zhu Yanjun <yanjun.zhu@xxxxxxxxxx>
+Reviewed-by: Gioh Kim <gi-oh.kim@xxxxxxxxxxxxxxxx>
> ---
> v4: use kvzalloc instead of vzalloc
> add one err condition check
> don't include vmalloc.h any more
>
> v3: use PAGE_SIZE instead of PAGE_SHIFT
> add comma to the end of enum variables
> include vmalloc.h header file to avoid build issues on Sparc
>
> v2: adjusted chunk size to reflect different architectures
>
> drivers/net/ethernet/mellanox/mlx4/icm.c | 16 +++++++++-------
> 1 file changed, 9 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/net/ethernet/mellanox/mlx4/icm.c b/drivers/net/ethernet/mellanox/mlx4/icm.c
> index a822f7a..685337d 100644
> --- a/drivers/net/ethernet/mellanox/mlx4/icm.c
> +++ b/drivers/net/ethernet/mellanox/mlx4/icm.c
> @@ -43,12 +43,12 @@
> #include "fw.h"
>
> /*
> - * We allocate in as big chunks as we can, up to a maximum of 256 KB
> - * per chunk.
> + * We allocate in page size (default 4KB on many archs) chunks to avoid high
> + * order memory allocations in fragmented/high usage memory situation.
> */
> enum {
> - MLX4_ICM_ALLOC_SIZE = 1 << 18,
> - MLX4_TABLE_CHUNK_SIZE = 1 << 18
> + MLX4_ICM_ALLOC_SIZE = PAGE_SIZE,
> + MLX4_TABLE_CHUNK_SIZE = PAGE_SIZE,
> };
>
> static void mlx4_free_icm_pages(struct mlx4_dev *dev, struct mlx4_icm_chunk *chunk)
> @@ -398,9 +398,11 @@ int mlx4_init_icm_table(struct mlx4_dev *dev, struct mlx4_icm_table *table,
> u64 size;
>
> obj_per_chunk = MLX4_TABLE_CHUNK_SIZE / obj_size;
> + if (WARN_ON(!obj_per_chunk))
> + return -EINVAL;
> num_icm = (nobj + obj_per_chunk - 1) / obj_per_chunk;
>
> - table->icm = kcalloc(num_icm, sizeof(*table->icm), GFP_KERNEL);
> + table->icm = kvzalloc(num_icm * sizeof(*table->icm), GFP_KERNEL);
> if (!table->icm)
> return -ENOMEM;
> table->virt = virt;
> @@ -446,7 +448,7 @@ int mlx4_init_icm_table(struct mlx4_dev *dev, struct mlx4_icm_table *table,
> mlx4_free_icm(dev, table->icm[i], use_coherent);
> }
>
> - kfree(table->icm);
> + kvfree(table->icm);
>
> return -ENOMEM;
> }
> @@ -462,5 +464,5 @@ void mlx4_cleanup_icm_table(struct mlx4_dev *dev, struct mlx4_icm_table *table)
> mlx4_free_icm(dev, table->icm[i], table->coherent);
> }
>
> - kfree(table->icm);
> + kvfree(table->icm);
> }
> --
> 2.9.3
>
--
GIOH KIM
Linux Kernel Entwickler
ProfitBricks GmbH
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D - 10405 Berlin
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