sunrpc: Replace the rq_bvec array with dynamically-allocated memory

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As a step towards making NFSD's maximum rsize and wsize variable at
run-time, replace the fixed-size rq_bvec[] array in struct svc_rqst
with a chunk of dynamically-allocated memory.

The rq_bvec[] array contains enough bio_vecs to handle each page in
a maximum size RPC message.

On a system with 8-byte pointers and 4KB pages, pahole reports that
the rq_bvec[] array is 4144 bytes. This patch replaces that array
with a single 8-byte pointer field.

Reviewed-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: NeilBrown <neil@brown.name>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

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This commit is contained in:

Chuck Lever 2025-04-28 15:36:54 -04:00

parent ed603bcf4f

commit 59cf734654

3 changed files with 11 additions and 5 deletions

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2

include/linux/sunrpc/svc.h

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7

net/sunrpc/svc.c

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7

net/sunrpc/svcsock.c

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