mm: page_alloc: generalize the dirty balance reserve

The dirty balance reserve that dirty throttling has to consider is
merely memory not available to userspace allocations.  There is nothing
writeback-specific about it.  Generalize the name so that it's reusable
outside of that context.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 3 deletions

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 3b6fb71bbeb3..33bb1b19273e 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -356,10 +356,10 @@ struct zone {
         struct per_cpu_pageset __percpu *pageset;
 
         /*
-         * This is a per-zone reserve of pages that should not be
-         * considered dirtyable memory.
+         * This is a per-zone reserve of pages that are not available
+         * to userspace allocations.
          */
-        unsigned long           dirty_balance_reserve;
+        unsigned long           totalreserve_pages;
 
 #ifndef CONFIG_SPARSEMEM
         /*