The attached 1-character change fixes a performance bug in
linux-2.4.0-test9 (and earlier). Without this patch, something as
simple as "cat /proc/self/maps" will read the "maps" file line by
line.
--david
--- linux-2.4.0-test9/fs/proc/array.c Fri Sep 8 14:34:59 2000
+++ lia64-kdb/fs/proc/array.c Mon Oct 9 19:01:07 2000
@@ -575,7 +575,7 @@
goto getlen_out;
/* Check whether the mmaps could change if we sleep */
- volatile_task = (task != current || atomic_read(&mm->mm_users) > 1);
+ volatile_task = (task != current || atomic_read(&mm->mm_users) > 2);
/* decode f_pos */
lineno = *ppos >> MAPS_LINE_SHIFT;
-
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