Andrew Morton wrote:
Neil Brown <neilb@xxxxxxx> wrote:
...
Reduce stack usage with stacked block devices
...
diff ./include/linux/sched.h~current~ ./include/linux/sched.h
--- ./include/linux/sched.h~current~ 2005-11-07 10:01:36.000000000 +1100
+++ ./include/linux/sched.h 2005-11-07 10:02:23.000000000 +1100
@@ -829,6 +829,9 @@ struct task_struct {
/* journalling filesystem info */
void *journal_info;
+/* stacked block device info */
+ struct bio *bio_list, **bio_tail;
+
/* VM state */
struct reclaim_state *reclaim_state;
More state in the task_strut is a bit sad, but not nearly as sad as deep
recursion in our deepest codepath..
Possibly one could do:
struct make_request_state {
struct bio *bio_list;
struct bio **bio_tail;
};
and stick a `struct make_request_state *' into the task_struct and actually
allocate the thing on the stack. That's not much nicer though.
Possibly it could go into struct io_context?
--
SUSE Labs, Novell Inc.
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