Re: manipulating sigmask from filesystems and drivers

[Paul Menage]

>> How about a sysctl that lets the user specify the size threshold at
>> which writes use a killable wait state rather than
>> TASK_UNINTERRUPTIBLE? (Probably defaulting to never.)
>
>/usr/include/linux/limits.h:#define PIPE_BUF        4096        /* #
>bytes in atomic write to a pipe */
>
>According to SUSv3, this is the maximum size that write is guaranteed to
>be atomic for.

But that doesn't mean that we can't allow the user to configure higher
limits if they're using some particular software that relies on (and
more importantly, has successfully relied upon in the past) the current 
behaviour of no interruptions.

Paul