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HWPOISON: Add PR_MCE_KILL prctl to control early kill behaviour per process

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This allows processes to override their early/late kill
behaviour on hardware memory errors.

Typically applications which are memory error aware is
better of with early kill (see the error as soon
as possible), all others with late kill (only
see the error when the error is really impacting execution)

There's a global sysctl, but this way an application
can set its specific policy.

We're using two bits, one to signify that the process
stated its intention and that

I also made the prctl future proof by enforcing
the unused arguments are 0.

The state is inherited to children.

Note this makes us officially run out of process flags
on 32bit, but the next patch can easily add another field.

Manpage patch will be supplied separately.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
This commit is contained in:
Andi Kleen 2009-09-16 11:50:14 +02:00 • committed by Andi Kleen
parent 6746aff74d
commit 4db96cf077
3 changed files with 26 additions and 0 deletions
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22
kernel/sys.c
View file

@ -1528,6 +1528,28 @@ SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3,
current->timer_slack_ns = arg2;
error = 0;
break;
case PR_MCE_KILL:
if (arg4 | arg5)
return -EINVAL;
switch (arg2) {
case 0:
if (arg3 != 0)
return -EINVAL;
current->flags &= ~PF_MCE_PROCESS;
break;
case 1:
current->flags |= PF_MCE_PROCESS;
if (arg3 != 0)
current->flags |= PF_MCE_EARLY;
else
current->flags &= ~PF_MCE_EARLY;
break;
default:
return -EINVAL;
}
error = 0;
break;
default:
error = -EINVAL;
break;