From: Rik van Riel <H.H.vanRiel@fys.ruu.nl>
To: linux-mm <linux-mm@kvack.org>
Cc: "Stephen C. Tweedie" <sct@dcs.ed.ac.uk>, werner@suse.de
Subject: memory limitation test kit (tm) :-)
Date: Thu, 26 Feb 1998 13:58:05 +0100 (MET) [thread overview]
Message-ID: <Pine.LNX.3.91.980226135506.30101A-100000@mirkwood.dummy.home> (raw)
Hi there,
I've made a 'very preliminary' test patch to test
whether memory limitation / quotation might work.
It's untested, untunable and plain wrong, but nevertheless
I'd like you all to take a look at it and point out things
that I've forgotten in the limitation code...
-----------------------------------------------------
--- linux2188orig/mm/page_alloc.c Thu Feb 26 13:51:16 1998
+++ linux-2.1.88/mm/page_alloc.c Thu Feb 26 13:09:17 1998
@@ -26,6 +26,7 @@
#include <asm/bitops.h>
#include <asm/pgtable.h>
#include <asm/spinlock.h>
+#include <asm/smp_lock.h> /* for (un)lock_kernel() */
int nr_swap_pages = 0;
int nr_free_pages = 0;
@@ -328,7 +329,20 @@
void swap_in(struct task_struct * tsk, struct vm_area_struct * vma,
pte_t * page_table, unsigned long entry, int write_access)
{
- unsigned long page = __get_free_page(GFP_KERNEL);
+ int i = 0;
+ unsigned long page = 0;
+ static int swap_out_process(struct task_struct *, int);
+
+ if (vma->vm_mm->rss > num_physpages / 2 && nr_free_pages <
+ free_pages_high) {
+ lock_kernel();
+ for (i = vma->vm_mm->rss; i > 0; i--)
+ if (swap_out_process(tsk, __GFP_IO|__GFP_WAIT))
+ break;
+ unlock_kernel();
+ }
+
+ page = __get_free_page(GFP_KERNEL);
if (pte_val(*page_table) != entry) {
free_page(page);
------------------------------------------------------------
Rik.
+-----------------------------+------------------------------+
| For Linux mm-patches, go to | "I'm busy managing memory.." |
| my homepage (via LinuxHQ). | H.H.vanRiel@fys.ruu.nl |
| ...submissions welcome... | http://www.fys.ruu.nl/~riel/ |
+-----------------------------+------------------------------+
next reply other threads:[~1998-02-26 14:03 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
1998-02-26 12:58 Rik van Riel [this message]
1998-02-26 15:32 ` Rik van Riel
1998-02-26 19:10 ` Dr. Werner Fink
1998-02-26 19:29 ` Rik van Riel
1998-02-26 22:53 ` Stephen C. Tweedie
1998-02-26 23:29 ` Rik van Riel
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