On Tue, 7 Jun 2011, Amir G. wrote:
> >
> >> +#define snapshot_test_delay_progress(i, from, to, max) \
> >> + do { \
> >> + if (snapshot_enable_test[i] && \
> >> + (max) > snapshot_enable_test[i] && \
> >> + (from) <= (to) && (to) <= (max)) { \
> >> + unsigned long blocks_per_ms = \
> >> + do_div((max), snapshot_enable_test[i]); \
> >> + unsigned long x = do_div((from), blocks_per_ms);\
> >> + unsigned long y = do_div((to), blocks_per_ms); \
> >> + if (y > x) \
> >> + msleep_interruptible(y - x); \
> >> + } \
> >> + } while (0)
> >> +
> >> +#define snapshot_debug_l(n, l, f, a...) \
> >> + do { \
> >> + if ((n) <= snapshot_enable_debug && \
> >> + (l) <= SNAPSHOT_INDENT_MAX) { \
> >> + printk(KERN_DEBUG "snapshot: %s" f, \
> >> + snapshot_indent - (l), \
> >> + ## a); \
> >> + } \
> >> + } while (0)
> >
> > This can be done by tracepoints maybe ?
>
> can you add a generic string arg to a tracepoint?
Yes, you can print whatever you want with tracepoint printk. See
include/trace/events/ext4.h, Documentation/trace/tracepoints.txt and
Documentation/trace/tracepoints-analysis.txt
Thanks!
-Lukas
