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author | Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> | 2020-11-09 18:24:05 -0800 |
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committer | Christoph Hellwig <hch@lst.de> | 2020-12-01 20:36:36 +0100 |
commit | dab3902b19a0dd1668d0cc3e8e4b976b1ee8638c (patch) | |
tree | b84904bd8d9dd8b51ec4b1183db90c66fddebc7a /lib/dim | |
parent | a4fe2d3afe3ce77edeadb567c0d0a8d102c6b159 (diff) |
nvmet: use inline bio for passthru fast path
In nvmet_passthru_execute_cmd() which is a high frequency function
it uses bio_alloc() which leads to memory allocation from the fs pool
for each I/O.
For NVMeoF nvmet_req we already have inline_bvec allocated as a part of
request allocation that can be used with preallocated bio when we
already know the size of request before bio allocation with bio_alloc(),
which we already do.
Introduce a bio member for the nvmet_req passthru anon union. In the
fast path, check if we can get away with inline bvec and bio from
nvmet_req with bio_init() call before actually allocating from the
bio_alloc().
This will be useful to avoid any new memory allocation under high
memory pressure situation and get rid of any extra work of
allocation (bio_alloc()) vs initialization (bio_init()) when
transfer len is < NVMET_MAX_INLINE_DATA_LEN that user can configure at
compile time.
Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'lib/dim')
0 files changed, 0 insertions, 0 deletions