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References: <20220831052734.3423079-1-song@kernel.org> <20220831160111.a6e7d17785ca21ce7c43981c@linux-foundation.org>
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From:   Song Liu <song@kernel.org>
Date:   Wed, 31 Aug 2022 17:47:35 -0700
Message-ID: <CAPhsuW4SGguyoFKpN8S=jFCWfLiDM-f5QwV7UPwkQ=LjQEXaNg@mail.gmail.com>
Subject: Re: [PATCH] mm/vmalloc: Extend find_vmap_lowest_match_check with
 extra arguments
To:     Andrew Morton <akpm@linux-foundation.org>
Cc:     Linux-MM <linux-mm@kvack.org>,
        open list <linux-kernel@vger.kernel.org>,
        Song Liu <songliubraving@fb.com>,
        Uladzislau Rezki <urezki@gmail.com>,
        Baoquan He <bhe@redhat.com>
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On Wed, Aug 31, 2022 at 4:01 PM Andrew Morton <akpm@linux-foundation.org> wrote:
>
> On Tue, 30 Aug 2022 22:27:34 -0700 Song Liu <song@kernel.org> wrote:
>
> > find_vmap_lowest_match() is now able to handle different roots. Make
> > similar changes to find_vmap_lowest_match_check() and
> > find_vmap_lowest_linear_match() to handle different trees.
>
> What are the runtime effects of this change?

The code is gated by DEBUG_AUGMENT_LOWEST_MATCH_CHECK. It
is only compiled when the developer enables it explicitly. Therefore,
there isn't
any runtime effect.

Thanks,
Song