Re: [PATCH v2] mm/vmscan: fix infinite loop in drop_slab_node

From: Matthew Wilcox
Date: Wed Sep 09 2020 - 17:49:22 EST

On Wed, Sep 09, 2020 at 07:59:44PM +0200, Vlastimil Babka wrote:
> - Exit also on other signals such as SIGABRT, SIGTERM? If I write to drop_caches
> and think it's too long, I would prefer to kill it by ctrl-c and not just kill
> -9. Dunno if the canonical way of testing for this is if
> (signal_pending(current)) or differently.

fatal_signal_pending() is the canonical way to do it. If your task has
installed a signal handler for ABRT or TERM, that's its prerogative,
but it's chosen not to get killed, and it's not allowed to see short
reads/writes, so we can't break out early.