linux-kernel - Re: [PATCH] lib: test module for find_*

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Message-Id: <20171109151520.053425b697cd808206996e07@linux-foundation.org>
Date:   Thu, 9 Nov 2017 15:15:20 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Yury Norov <ynorov@...iumnetworks.com>
Cc:     linux-kernel@...r.kernel.org,
        Alexey Dobriyan <adobriyan@...il.com>,
        Clement Courbet <courbet@...gle.com>,
        Matthew Wilcox <mawilcox@...rosoft.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>
Subject: Re: [PATCH] lib: test module for find_*_bit() functions

On Thu,  9 Nov 2017 17:07:14 +0300 Yury Norov <ynorov@...iumnetworks.com> wrote:

> find_bit functions are widely used in the kernel, including hot paths.
> This module tests performance of that functions in 2 typical scenarios:
> randomly filled bitmap with relatively equal distribution of set and
> cleared bits, and sparse bitmap which has 1 set bit for 500 cleared bits.
> 
> ...
>
> +config TEST_FIND_BIT

Well.  It doesn't actually "test" the code.  It measures its performance ;)