linux-kernel - Re: [PATCH v2 7/7] swap, put_swap_page: Share more between huge/normal code path

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Date:   Wed, 18 Jul 2018 08:13:34 -0700
From:   Dave Hansen <dave.hansen@...ux.intel.com>
To:     "Huang, Ying" <ying.huang@...el.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Michal Hocko <mhocko@...e.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Shaohua Li <shli@...nel.org>, Hugh Dickins <hughd@...gle.com>,
        Minchan Kim <minchan@...nel.org>,
        Rik van Riel <riel@...hat.com>,
        Daniel Jordan <daniel.m.jordan@...cle.com>,
        Dan Williams <dan.j.williams@...el.com>
Subject: Re: [PATCH v2 7/7] swap, put_swap_page: Share more between
 huge/normal code path

On 07/17/2018 07:56 PM, Huang, Ying wrote:
> -.orc_unwind_ip                        1380      0
> -.orc_unwind                           2070      0
> -Total                                26810
> +.orc_unwind_ip                        1480      0
> +.orc_unwind                           2220      0
> +Total                                27172
> 
> The total difference is same: 27172 - 26810 = 362 = 24577 - 24215.
> 
> The text section difference is small: 17927 - 17815 = 112.  The
> additional size change comes from unwinder information: (1480 + 2220) -
> (1380 + 2070) = 250.  If the frame pointer unwinder is chosen, this cost
> nothing, but if the ORC unwinder is chosen, this is the real difference.
> 
> For 112 text section difference, use 'objdump -t' to get symbol size and
> compare,

Cool, thanks for doing this!

I think what you've done here is great for readability and the binary
size increase is well worth the modest size increase.