Add tsleep_nsec(9), msleep_nsec(9), and rwsleep_nsec(9).

Equivalent to their unsuffixed counterparts except that (a) they take
a timeout in terms of nanoseconds, and (b) INFSLP, aka UINT64_MAX (not
zero) indicates that a timeout should not be set.

For now, zero nanoseconds is not a strictly valid invocation: we log a
warning on DIAGNOSTIC kernels if we see such a call.  We still sleep
until the next tick in such a case, however.  In the future this could
become some sort of poll... TBD.

To facilitate conversions to these interfaces: add inline conversion
functions to sys/time.h for turning your timeout into nanoseconds.

Also do a few easy conversions for warmup and to demonstrate how
further conversions should be done.

Lots of input from mpi@ and ratchov@.  Additional input from tedu@,
deraadt@, mortimer@, millert@, and claudio@.

Partly inspired by FreeBSD r247787.

positive feedback from deraadt@, ok mpi@

1 files changed, 3 insertions, 2 deletions

diff --git a/sys/uvm/uvm_pmemrange.c b/sys/uvm/uvm_pmemrange.c
index cd92c319650..7d9e2a52b67 100644
--- a/sys/uvm/uvm_pmemrange.c
+++ b/sys/uvm/uvm_pmemrange.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: uvm_pmemrange.c,v 1.54 2019/05/09 20:36:44 beck Exp $	*/
+/*	$OpenBSD: uvm_pmemrange.c,v 1.55 2019/07/03 22:39:33 cheloha Exp $	*/
 
 /*
  * Copyright (c) 2009, 2010 Ariane van der Steldt <ariane@stack.nl>
@@ -1928,7 +1928,8 @@ uvm_wait_pla(paddr_t low, paddr_t high, paddr_t size, int failok)
 		 * uvm_wait(), as this is exactly the same issue.
 		 */
 		printf("pagedaemon: wait_pla deadlock detected!\n");
-		msleep(&uvmexp.free, &uvm.fpageqlock, PVM, wmsg, hz >> 3);
+		msleep_nsec(&uvmexp.free, &uvm.fpageqlock, PVM, wmsg,
+		    MSEC_TO_NSEC(125));
 #if defined(DEBUG)
 		/* DEBUG: panic so we can debug it */
 		panic("wait_pla pagedaemon deadlock");