2017-03-28 22:01 GMT+09:00 Dmitry Vyukov <dvyukov@xxxxxxxxxx>: > Add /proc/self/task/<current-tid>/fail-nth file that allows failing > 0-th, 1-st, 2-nd and so on calls systematically. > Excerpt from the added documentation: > > === > Write to this file of integer N makes N-th call in the current task fail > (N is 0-based). Read from this file returns a single char 'Y' or 'N' > that says if the fault setup with a previous write to this file was > injected or not, and disables the fault if it wasn't yet injected. > Note that this file enables all types of faults (slab, futex, etc). > This setting takes precedence over all other generic settings like > probability, interval, times, etc. But per-capability settings > (e.g. fail_futex/ignore-private) take precedence over it. > This feature is intended for systematic testing of faults in a single > system call. See an example below. > === This asymmetric read/write interface looks a bit odd. (write a string representation of integer, but read Y or N). How about just return the string representation of task->fail_nth for read and let the user space tools check if it is zero or not? -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
