svn commit: r328776 - head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs

[Andriy Gapon]

Author: avg
Date: Fri Feb  2 12:57:33 2018
New Revision: 328776
URL: https://svnweb.freebsd.org/changeset/base/328776

Log:
  ZFS ARC: restore illumos uses of 'needfree' that were removed in r325851
  
  This is purely a cosmetic change to have a more complete copy of
  ifdef-ed out illumos code.
  
  MFC after:	1 week

Modified:
  head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c

Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c
==============================================================================
--- head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c	Fri Feb  2 12:52:42 2018	(r328775)
+++ head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c	Fri Feb  2 12:57:33 2018	(r328776)
@@ -4236,6 +4236,7 @@ arc_available_memory(void)
 	free_memory_reason_t r = FMR_UNKNOWN;
 
 #ifdef _KERNEL
+#ifdef __FreeBSD__
 	/*
 	 * Cooperate with pagedaemon when it's time for it to scan
 	 * and reclaim some pages.
@@ -4246,7 +4247,15 @@ arc_available_memory(void)
 		r = FMR_LOTSFREE;
 	}
 
-#ifdef illumos
+#else
+	if (needfree > 0) {
+		n = PAGESIZE * (-needfree);
+		if (n < lowest) {
+			lowest = n;
+			r = FMR_NEEDFREE;
+		}
+	}
+
 	/*
 	 * check that we're out of range of the pageout scanner.  It starts to
 	 * schedule paging if freemem is less than lotsfree and needfree.
@@ -4289,7 +4298,7 @@ arc_available_memory(void)
 		r = FMR_PAGES_PP_MAXIMUM;
 	}
 
-#endif	/* illumos */
+#endif	/* __FreeBSD__ */
 #if defined(__i386) || !defined(UMA_MD_SMALL_ALLOC)
 	/*
 	 * If we're on an i386 platform, it's possible that we'll exhaust the
@@ -4482,6 +4491,11 @@ arc_reclaim_thread(void *dummy __unused)
 			int64_t to_free =
 			    (arc_c >> arc_shrink_shift) - free_memory;
 			if (to_free > 0) {
+#ifdef _KERNEL
+#ifdef illumos
+				to_free = MAX(to_free, ptob(needfree));
+#endif
+#endif
 				arc_shrink(to_free);
 			}
 		} else if (free_memory < arc_c >> arc_no_grow_shift) {