Re: [PATCH] mm/kmemleak: add support for re-enable kmemleak at runtime

From: Jianguo Wu
Date: Sat Jan 18 2014 - 03:42:28 EST

On 2014/1/17 20:04, Catalin Marinas wrote:

> On Fri, Jan 17, 2014 at 09:40:02AM +0000, Jianguo Wu wrote:
>> Now disabling kmemleak is an irreversible operation, but sometimes
>> we may need to re-enable kmemleak at runtime. So add a knob to enable
>> kmemleak at runtime:
>> echo on > /sys/kernel/debug/kmemleak
> It is irreversible for very good reason: once it missed the initial
> memory allocations, there is no way for kmemleak to build the object
> reference graph and you'll get lots of false positives, pretty much
> making it unusable.

Do you mean we didn't trace memory allocations during kmemleak disable period,
and these memory may reference to new allocated objects after re-enable?

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