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authorChuck Lever <chuck.lever@oracle.com>2022-06-07 23:47:58 +0300
committerChuck Lever <chuck.lever@oracle.com>2022-06-08 19:39:37 +0300
commit62ed448cc53b654036f7d7f3c99f299d79ad14c3 (patch)
tree8c239a47853628dff53a3829221b00baa6220910 /net
parent6c254bf3b637dd4ef4f78eb78c7447419c0161d7 (diff)
downloadlinux-62ed448cc53b654036f7d7f3c99f299d79ad14c3.tar.xz
SUNRPC: Optimize xdr_reserve_space()
Transitioning between encode buffers is quite infrequent. It happens about 1 time in 400 calls to xdr_reserve_space(), measured on NFSD with a typical build/test workload. Force the compiler to remove that code from xdr_reserve_space(), which is a hot path on both the server and the client. This change reduces the size of xdr_reserve_space() from 10 cache lines to 2 when compiled with -Os. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Reviewed-by: J. Bruce Fields <bfields@fieldses.org>
Diffstat (limited to 'net')
-rw-r--r--net/sunrpc/xdr.c17
1 files changed, 10 insertions, 7 deletions
diff --git a/net/sunrpc/xdr.c b/net/sunrpc/xdr.c
index b57cf9df4de8..1ad8b4ef14de 100644
--- a/net/sunrpc/xdr.c
+++ b/net/sunrpc/xdr.c
@@ -919,7 +919,7 @@ void xdr_init_encode(struct xdr_stream *xdr, struct xdr_buf *buf, __be32 *p,
EXPORT_SYMBOL_GPL(xdr_init_encode);
/**
- * xdr_commit_encode - Ensure all data is written to buffer
+ * __xdr_commit_encode - Ensure all data is written to buffer
* @xdr: pointer to xdr_stream
*
* We handle encoding across page boundaries by giving the caller a
@@ -931,22 +931,25 @@ EXPORT_SYMBOL_GPL(xdr_init_encode);
* required at the end of encoding, or any other time when the xdr_buf
* data might be read.
*/
-inline void xdr_commit_encode(struct xdr_stream *xdr)
+void __xdr_commit_encode(struct xdr_stream *xdr)
{
int shift = xdr->scratch.iov_len;
void *page;
- if (shift == 0)
- return;
page = page_address(*xdr->page_ptr);
memcpy(xdr->scratch.iov_base, page, shift);
memmove(page, page + shift, (void *)xdr->p - page);
xdr_reset_scratch_buffer(xdr);
}
-EXPORT_SYMBOL_GPL(xdr_commit_encode);
+EXPORT_SYMBOL_GPL(__xdr_commit_encode);
-static __be32 *xdr_get_next_encode_buffer(struct xdr_stream *xdr,
- size_t nbytes)
+/*
+ * The buffer space to be reserved crosses the boundary between
+ * xdr->buf->head and xdr->buf->pages, or between two pages
+ * in xdr->buf->pages.
+ */
+static noinline __be32 *xdr_get_next_encode_buffer(struct xdr_stream *xdr,
+ size_t nbytes)
{
__be32 *p;
int space_left;