I didn't find specific patch for this comment so I'll leave it to patch -00.
What if ploop_dispatch_pios and do_ploop_run_work(do_ploop_work) run
concurrently for one ploop on different cpus? Would not it be bad if
ploop_dispatch_pios only dispatched part of pios and do_ploop_run_work
already starts processing them, or if do_ploop_run_work yet does not
"see" all pios from already fully dispatched ploop_dispatch_pios? That
can lead to arbitrary pio reordering.
For instance imagine:
ploop_dispatch_pios () {
do_ploop_run_work () {
llcow_pios = llist_del_all(...);
...
add data pio #1
add data pio #2
add flush pio #3
llflush_pios = llist_del_all(...);
process_ploop_fsync_work(llflush_pios);
}
}
This way a flush pio #3 will be processed before data pios #1 and #2.
--
Best regards, Tikhomirov Pavel
Senior Software Developer, Virtuozzo.
_______________________________________________
Devel mailing list
Devel@openvz.org
https://lists.openvz.org/mailman/listinfo/devel
