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9p: embed fcall in req to round down buffer allocs

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'msize' is often a power of two, or at least page-aligned, so avoiding
an overhead of two dozen bytes for each allocation will help the
allocator do its work and reduce memory fragmentation.

Link: http://lkml.kernel.org/r/1533825236-22896-1-git-send-email-asmadeus@codewreck.org
Suggested-by: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr>
Reviewed-by: Greg Kurz <groug@kaod.org>
Acked-by: Jun Piao <piaojun@huawei.com>
Cc: Matthew Wilcox <willy@infradead.org>
This commit is contained in:
Dominique Martinet
2018-07-30 05:55:19 +00:00
parent 6348b903d7
commit 523adb6cc1
6 changed files with 125 additions and 118 deletions
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12
net/9p/trans_fd.c
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@@ -354,7 +354,7 @@ static void p9_read_work(struct work_struct *work)
goto error;
}
if (m->req->rc == NULL) {
if (!m->req->rc.sdata) {
p9_debug(P9_DEBUG_ERROR,
"No recv fcall for tag %d (req %p), disconnecting!\n",
m->rc.tag, m->req);
@@ -362,7 +362,7 @@ static void p9_read_work(struct work_struct *work)
err = -EIO;
goto error;
}
m->rc.sdata = (char *)m->req->rc + sizeof(struct p9_fcall);
m->rc.sdata = m->req->rc.sdata;
memcpy(m->rc.sdata, m->tmp_buf, m->rc.capacity);
m->rc.capacity = m->rc.size;
}
@@ -372,7 +372,7 @@ static void p9_read_work(struct work_struct *work)
*/
if ((m->req) && (m->rc.offset == m->rc.capacity)) {
p9_debug(P9_DEBUG_TRANS, "got new packet\n");
m->req->rc->size = m->rc.offset;
m->req->rc.size = m->rc.offset;
spin_lock(&m->client->lock);
if (m->req->status != REQ_STATUS_ERROR)
status = REQ_STATUS_RCVD;
@@ -469,8 +469,8 @@ static void p9_write_work(struct work_struct *work)
p9_debug(P9_DEBUG_TRANS, "move req %p\n", req);
list_move_tail(&req->req_list, &m->req_list);
m->wbuf = req->tc->sdata;
m->wsize = req->tc->size;
m->wbuf = req->tc.sdata;
m->wsize = req->tc.size;
m->wpos = 0;
spin_unlock(&m->client->lock);
}
@@ -663,7 +663,7 @@ static int p9_fd_request(struct p9_client *client, struct p9_req_t *req)
struct p9_conn *m = &ts->conn;
p9_debug(P9_DEBUG_TRANS, "mux %p task %p tcall %p id %d\n",
m, current, req->tc, req->tc->id);
m, current, &req->tc, req->tc.id);
if (m->err < 0)
return m->err;