kernel/vm: Add discard_address_range that discards pages.

Pages in the given range are unmapped and freed without getting written back anywhere. It can be used whenever a caller does not care about the data in the given range anymore and wants to reduce page pressure. Change-Id: I8bcce68fab278efef710d3714677e1d463504a56 Reviewed-on: https://review.haiku-os.org/c/haiku/+/2843 Reviewed-by: waddlesplash <[email protected]>
2020-08-01 19:23:27 +00:00
parent 4bfc0072e3
commit 8e74e30784
5 changed files with 71 additions and 0 deletions
@@ -135,6 +135,8 @@ public:
 	virtual	status_t			Adopt(VMCache* source, off_t offset, off_t size,
 									off_t newOffset);

+	virtual	status_t			Discard(off_t offset, off_t size);
+
 			status_t			FlushAndRemoveAllPages();

 			void*				UserData()	{ return fUserData; }