linux-kernel - [RFC][PATCH 1/2] Swap token re-tuned

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [day] [month] [year] [list]

Message-Id: <1159556677.2141.23.camel@localhost.localdomain>
Date:	Sat, 30 Sep 2006 00:34:36 +0530
From:	Ashwin Chaugule <ashwin.chaugule@...unite.com>
To:	linux-kernel@...r.kernel.org
Subject: [RFC][PATCH 1/2] Swap token re-tuned

Try to grab swap token before the VM selects pages for eviction. 


Signed-off-by: Ashwin Chaugule <ashwin.chaugule@...unite.com> 


diff --git a/mm/filemap.c b/mm/filemap.c
index afcdc72..190d2c1 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1478,8 +1478,8 @@ no_cached_page:
 	 * We're only likely to ever get here if MADV_RANDOM is in
 	 * effect.
 	 */
+	grab_swap_token(); /* Contend for token _before_ we read-in */
 	error = page_cache_read(file, pgoff);
-	grab_swap_token();
 
 	/*
 	 * The page we want has now been added to the page cache.
diff --git a/mm/memory.c b/mm/memory.c
index 92a3ebd..52eb9b8 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1974,6 +1974,7 @@ static int do_swap_page(struct mm_struct
 	delayacct_set_flag(DELAYACCT_PF_SWAPIN);
 	page = lookup_swap_cache(entry);
 	if (!page) {
+		grab_swap_token(); /* Contend for token _before_ we read-in */
  		swapin_readahead(entry, address, vma);
  		page = read_swap_cache_async(entry, vma, address);
 		if (!page) {
@@ -1991,7 +1992,6 @@ static int do_swap_page(struct mm_struct
 		/* Had to read the page from swap area: Major fault */
 		ret = VM_FAULT_MAJOR;
 		count_vm_event(PGMAJFAULT);
-		grab_swap_token();
 	}
 
 	delayacct_clear_flag(DELAYACCT_PF_SWAPIN);
diff --git a/mm/thrash.c b/mm/thrash.c


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/