[PATCH] Avoid !__GFP_IO allocations to eat from memory reservations

Marcelo Tosatti
2001-06-14T14:34:53Z

Message-ID: <Pine.LNX.4.21.0106140949550.8439-100000@freak.distro.conectiva>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII

Linus,

In pre3, GFP_BUFFER allocations can eat from the "emergency" memory
reservations in case try_to_free_pages() fails for those allocations in
__alloc_pages().

Here goes the (tested) patch to fix that:

--- linux/mm/page_alloc.c.orig Thu Jun 14 11:00:14 2001
+++ linux/mm/page_alloc.c Thu Jun 14 11:32:56 2001
@@ -453,6 +453,12 @@
int progress = try_to_free_pages(gfp_mask);
if (progress || gfp_mask & __GFP_IO)
goto try_again;
+ /*
+ * Fail in case no progress was made and the
+ * allocation may not be able to block on IO.
+ */
+ else
+ return NULL;
}
}
}