The patch titled
Subject: SUNRPC: refresh rq_pages using a bulk page allocator
has been added to the -mm tree. Its filename is
sunrpc-refresh-rq_pages-using-a-bulk-page-allocator.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/sunrpc-refresh-rq_pages-using-a-bulk-page-allocator.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/sunrpc-refresh-rq_pages-using-a-bulk-page-allocator.patch
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Chuck Lever <chuck.lever@xxxxxxxxxx>
Subject: SUNRPC: refresh rq_pages using a bulk page allocator
Reduce the rate at which nfsd threads hammer on the page allocator. This
improves throughput scalability by enabling the threads to run more
independently of each other.
[mgorman: Update interpretation of alloc_pages_bulk return value]
Link: https://lkml.kernel.org/r/20210325114228.27719-8-mgorman@xxxxxxxxxxxxxxxxxxx
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
Signed-off-by: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Reviewed-by: Alexander Lobakin <alobakin@xxxxx>
Cc: Alexander Duyck <alexander.duyck@xxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Cc: David Miller <davem@xxxxxxxxxxxxx>
Cc: Ilias Apalodimas <ilias.apalodimas@xxxxxxxxxx>
Cc: Jesper Dangaard Brouer <brouer@xxxxxxxxxx>
Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
net/sunrpc/svc_xprt.c | 31 +++++++++++++++----------------
1 file changed, 15 insertions(+), 16 deletions(-)
--- a/net/sunrpc/svc_xprt.c~sunrpc-refresh-rq_pages-using-a-bulk-page-allocator
+++ a/net/sunrpc/svc_xprt.c
@@ -643,30 +643,29 @@ static int svc_alloc_arg(struct svc_rqst
{
struct svc_serv *serv = rqstp->rq_server;
struct xdr_buf *arg = &rqstp->rq_arg;
- int pages;
- int i;
+ unsigned long pages, filled;
- /* now allocate needed pages. If we get a failure, sleep briefly */
pages = (serv->sv_max_mesg + 2 * PAGE_SIZE) >> PAGE_SHIFT;
if (pages > RPCSVC_MAXPAGES) {
- pr_warn_once("svc: warning: pages=%u > RPCSVC_MAXPAGES=%lu\n",
+ pr_warn_once("svc: warning: pages=%lu > RPCSVC_MAXPAGES=%lu\n",
pages, RPCSVC_MAXPAGES);
/* use as many pages as possible */
pages = RPCSVC_MAXPAGES;
}
- for (i = 0; i < pages ; i++)
- while (rqstp->rq_pages[i] == NULL) {
- struct page *p = alloc_page(GFP_KERNEL);
- if (!p) {
- set_current_state(TASK_INTERRUPTIBLE);
- if (signalled() || kthread_should_stop()) {
- set_current_state(TASK_RUNNING);
- return -EINTR;
- }
- schedule_timeout(msecs_to_jiffies(500));
- }
- rqstp->rq_pages[i] = p;
+
+ for (;;) {
+ filled = alloc_pages_bulk_array(GFP_KERNEL, pages,
+ rqstp->rq_pages);
+ if (filled == pages)
+ break;
+
+ set_current_state(TASK_INTERRUPTIBLE);
+ if (signalled() || kthread_should_stop()) {
+ set_current_state(TASK_RUNNING);
+ return -EINTR;
}
+ schedule_timeout(msecs_to_jiffies(500));
+ }
rqstp->rq_page_end = &rqstp->rq_pages[pages];
rqstp->rq_pages[pages] = NULL; /* this might be seen in nfsd_splice_actor() */
_
Patches currently in -mm which might be from chuck.lever@xxxxxxxxxx are
sunrpc-set-rq_page_end-differently.patch
sunrpc-refresh-rq_pages-using-a-bulk-page-allocator.patch
