lkml.org 
[lkml]   [2001]   [Aug]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectSwap reclaiming
Hi!

Browsing through 2.4.8 patch, I found this:

+/*
+ * When swap space gets filled up, we will set this flag.
+ * This will make do_swap_page(), in the page fault path,
+ * free swap entries on swapin so we'll reclaim swap space
+ * in order to be able to swap something out.
+ *
+ * At the moment we start reclaiming when swap usage goes
+ * over 80% of swap space.
+ *
+ * XXX: Random numbers, fixme.
+ */
+#define SWAP_FULL_PCT 80
+int vm_swap_full (void)
+{
+ int swap_used = total_swap_pages - nr_swap_pages;
+
+ return swap_used * 100 > total_swap_pages * SWAP_FULL_PCT;
+}
+
Hmm... This kind-of defeats purposes on swap priorities: with this,
you are going to fill slow swap even through there is lots of fast
swap that could be reclaimed.

I'm not sure what fix should be.
Pavel
--
I'm pavel@ucw.cz. "In my country we have almost anarchy and I don't care."
Panos Katsaloulis describing me w.r.t. patents at discuss@linmodems.org
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 12:58    [from the cache]
©2003-2011 Jasper Spaans