Count swap faults which need to read data from the swap area as major faults

Count swap faults which need to read data from the swap area as major faults

[Marcelo Tosatti]

Hi, 

Right now we are not accounting faults which nee to read data from swap as
major faults. 

The following patch should fix that. 

Against -ac28. (probably applies against 2.4.3-ac2) 

--- linux/mm/memory.c.orig	Tue Apr  3 21:30:03 2001
+++ linux/mm/memory.c	Tue Apr  3 21:32:18 2001
@@ -1112,6 +1112,7 @@
 {
 	struct page *page;
 	pte_t pte;
+	int ret = 1;
 
 	spin_unlock(&mm->page_table_lock);
 	page = lookup_swap_cache(entry);
@@ -1125,6 +1126,9 @@
 			return -1;
 		}
 
+		/* Had to read the page from swap area: Major fault */
+		ret = 2;
+
 		flush_page_to_ram(page);
 		flush_icache_page(vma, page);
 	}
@@ -1160,7 +1164,7 @@
 
 	/* No need to invalidate - it was non-present before */
 	update_mmu_cache(vma, address, pte);
-	return 1;	/* Minor fault */
+	return ret;
 }
 
 /*

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Re: Count swap faults which need to read data from the swap area as major faults

[Rik van Riel]

On Tue, 3 Apr 2001, Marcelo Tosatti wrote:

> Right now we are not accounting faults which nee to read data from
> swap as major faults.
> 
> The following patch should fix that. 

Looks good....

regards,

Rik
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