Re: [patch] balanced highmem subsystem under pre7-9

[Ingo Molnar <mingo@elte.hu>]

yes, this appears to have done the trick (patch attached). A 15MB/sec
stream of pure read activity started filling up highmem first. There was
still a light spike of kswapd activity once highmem got filled up, but it
stabilized after a few seconds. Then the pagecache filled up the normal
zone just as fast as it filled up the highmem zone, and now it's in steady
state, with kswapd using up ~5% CPU time [fluctuating, sometimes as high
as 15%, sometimes zero]. (it's recycling LRU pages?) Cool!

	Ingo

--- linux/mm/vmscan.c.orig	Fri May 12 12:28:58 2000
+++ linux/mm/vmscan.c	Fri May 12 12:29:50 2000
@@ -543,13 +543,14 @@
 				something_to_do = 1;
 				do_try_to_free_pages(GFP_KSWAPD);
 				if (tsk->need_resched)
-					schedule();
+					goto sleep;
 			}
 			run_task_queue(&tq_disk);
 			pgdat = pgdat->node_next;
 		} while (pgdat);
 
 		if (!something_to_do) {
+sleep:
 			tsk->state = TASK_INTERRUPTIBLE;
 			interruptible_sleep_on(&kswapd_wait);
 		}

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