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cifs: keep a reusable kvec array for receives
Having to continually allocate a new kvec array is expensive. Allocate one that's big enough, and only reallocate it as needed. Reviewed-and-Tested-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Jeff Layton <jlayton@redhat.com>
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@ -292,6 +292,8 @@ struct TCP_Server_Info {
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bool sec_kerberos; /* supports plain Kerberos */
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bool sec_mskerberos; /* supports legacy MS Kerberos */
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struct delayed_work echo; /* echo ping workqueue job */
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struct kvec *iov; /* reusable kvec array for receives */
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unsigned int nr_iov; /* number of kvecs in array */
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#ifdef CONFIG_CIFS_FSCACHE
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struct fscache_cookie *fscache; /* client index cache cookie */
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#endif
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@ -410,6 +410,24 @@ kvec_array_init(struct kvec *new, struct kvec *iov, unsigned int nr_segs,
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return nr_segs;
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}
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static struct kvec *
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get_server_iovec(struct TCP_Server_Info *server, unsigned int nr_segs)
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{
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struct kvec *new_iov;
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if (server->iov && nr_segs <= server->nr_iov)
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return server->iov;
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/* not big enough -- allocate a new one and release the old */
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new_iov = kmalloc(sizeof(*new_iov) * nr_segs, GFP_NOFS);
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if (new_iov) {
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kfree(server->iov);
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server->iov = new_iov;
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server->nr_iov = nr_segs;
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}
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return new_iov;
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}
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static int
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readv_from_socket(struct TCP_Server_Info *server, struct kvec *iov_orig,
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unsigned int nr_segs, unsigned int to_read)
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@ -420,7 +438,7 @@ readv_from_socket(struct TCP_Server_Info *server, struct kvec *iov_orig,
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struct msghdr smb_msg;
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struct kvec *iov;
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iov = kmalloc(sizeof(*iov_orig) * nr_segs, GFP_NOFS);
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iov = get_server_iovec(server, nr_segs);
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if (!iov)
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return -ENOMEM;
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@ -464,7 +482,6 @@ readv_from_socket(struct TCP_Server_Info *server, struct kvec *iov_orig,
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break;
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}
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}
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kfree(iov);
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return total_read;
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}
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@ -669,6 +686,7 @@ static void clean_demultiplex_info(struct TCP_Server_Info *server)
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}
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kfree(server->hostname);
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kfree(server->iov);
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kfree(server);
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length = atomic_dec_return(&tcpSesAllocCount);
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