Re: [PATCH 2/4] kmemleak: Handle percpu memory allocation

[Catalin Marinas]

On Tue, Oct 04, 2011 at 05:59:58PM +0100, Tejun Heo wrote:
> Hello, Catalin.
> 
> On Tue, Oct 04, 2011 at 10:26:24AM +0100, Catalin Marinas wrote:
> > Before kmemleak is initialised we still get memory allocations that
> > kmemleak stores in an early_log buffer (via the log_early() function
> > called from kmemleak_alloc_percpu). Later when kmemleak has all the data
> > structures in place, the kmemleak_init() function goes through the
> > early_log array and replays the previously recorded requests. The
> > early_alloc_percpu() function is used during early_log replaying and it
> > indeed registers every percpu memory block but the early_log is always
> > O(#PCPU_ALLOCS).
> > 
> > The reason we don't call kmemleak_alloc_percpu() directly during
> > replaying is that early_alloc() also copies the previously recorded
> > stack trace into the newly created object (otherwise all early
> > allocations would be shown as done by kmemleak_init).
> 
> Ah, okay, I was misreading the patch.  For some reason, log_early()
> was nested inside for_each_possible_cpu(), but one other thing.
> kmemleak_free_percpu() is calling log_early() w/ KMEMLEAK_FREE.
> Shouldn't it be KMEMLEAK_FREE_PERCPU?

Good point, I updated the patch.

Thanks.

-- 
Catalin
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/