Re: [PATCH 4/5] cpuset memory spread slab cache optimizations

[Paul Jackson <pj@sgi.com>]

Andrew wrote:
> perhaps a weaselly comment would cover that worry.

Well ... the comment was there, but the problem with comments
is no one reads them ;)

+ * The task struct 'p' should either be current or a newly
+ * forked child that is not visible on the task list yet.
+ */
+
+void mpol_set_task_struct_flag(struct task_struct *p)


> this function's interface really does invite that
> race and hence is not very good

Agreed.  I'm still scratching my head coming up with a better way.

Hmmm ... except for the call from fork, all calls to this are from
within mm/mempolicy.c.  I could make the routine within mempolicy.c
static, and provide an exported wrapper with a name like:

	mpol_fix_fork_child_flag()

that wrapped it.  With a name like that, there seems less risk of
abusing this.

Any other suggestions?

-- 
                  I won't rest till it's the best ...
                  Programmer, Linux Scalability
                  Paul Jackson <pj@sgi.com> 1.925.600.0401