linux-kernel - Re: [PATCH v2] kmemleak: skip scanning holes in the .bss section

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Date:   Wed, 20 Mar 2019 16:04:32 -0400
From:   Qian Cai <cai@....pw>
To:     Catalin Marinas <catalin.marinas@....com>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     akpm@...ux-foundation.org, paulus@...abs.org,
        benh@...nel.crashing.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, kvm-ppc@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v2] kmemleak: skip scanning holes in the .bss section

On Wed, 2019-03-20 at 18:16 +0000, Catalin Marinas wrote:
> I think I have a simpler idea. Kmemleak allows punching holes in
> allocated objects, so just turn the data/bss sections into dedicated
> kmemleak objects. This happens when kmemleak is initialised, before the
> initcalls are invoked. The kvm_free_tmp() would just free the
> corresponding part of the bss.
> 
> Patch below, only tested briefly on arm64. Qian, could you give it a try
> on powerpc? Thanks.

It works great so far!