Commit 22a027e8 authored by Chuck Lever's avatar Chuck Lever Committed by J. Bruce Fields
Browse files

SUNRPC: Add trace event when alloc_pages_bulk() makes no progress 



This is an operational low memory situation that needs to be
flagged. The new tracepoint records a timestamp and the nfsd thread
that failed to allocate pages.

Signed-off-by: default avatarChuck Lever <chuck.lever@oracle.com>
Signed-off-by: default avatarJ. Bruce Fields <bfields@redhat.com>
parent 45f13584

include/trace/events/sunrpc.h

+18 −0
Original line number Diff line number Diff line
@@ -1859,6 +1859,24 @@ TRACE_EVENT(svc_wake_up, 
	TP_printk("pid=%d", __entry->pid)

);



TRACE_EVENT(svc_alloc_arg_err,

	TP_PROTO(

		unsigned int pages

	),



	TP_ARGS(pages),



	TP_STRUCT__entry(

		__field(unsigned int, pages)

	),



	TP_fast_assign(

		__entry->pages = pages;

	),



	TP_printk("pages=%u", __entry->pages)

);



TRACE_EVENT(svc_handle_xprt,

	TP_PROTO(struct svc_xprt *xprt, int len),

net/sunrpc/svc_xprt.c

+1 −0
Original line number Diff line number Diff line
@@ -687,6 +687,7 @@ static int svc_alloc_arg(struct svc_rqst *rqstp) 
			set_current_state(TASK_RUNNING);

			return -EINTR;

		}

		trace_svc_alloc_arg_err(pages);

		schedule_timeout(msecs_to_jiffies(500));

	}

	rqstp->rq_page_end = &rqstp->rq_pages[pages];