[PATCH] Core: monitoring anonymous map on Darwin platform

[Maxim Dounin]

Hello!

On Fri, Aug 23, 2019 at 06:00:29AM +0100, David Carlier wrote:

> # HG changeset patch
> # User David Carlier <devnexen at gmail.com>
> # Date 1566493379 -3600
> #      Thu Aug 22 18:02:59 2019 +0100
> # Node ID adc68231e590554860b11ee851b293e46ba652db
> # Parent  9f1f9d6e056a4f85907957ef263f78a426ae4f9c
> Core: monitoring anonymous map on Darwin platform.
> 
> Allows to highligh those pages from nginx process with
> this identifier.
> 
> diff -r 9f1f9d6e056a -r adc68231e590 auto/os/darwin
> --- a/auto/os/darwin	Mon Aug 19 15:16:06 2019 +0300
> +++ b/auto/os/darwin	Thu Aug 22 18:02:59 2019 +0100
> @@ -118,3 +118,21 @@
>  ngx_feature_test="int32_t  lock = 0;
>                    if (!OSAtomicCompareAndSwap32Barrier(0, 1, &lock)) return 1"
>  . auto/feature
> +
> +# Darwin can tag anonymous pages to be tracked
> +# with tools like vmmap
> +# free ID are guaranteed to be free from 240 to 255
> +# for userland applications

Could you please clarify how this is expected to help?  As far as 
I can see, relevant memory regions can be easily identified in 
vmmap even without tags.

[...]

-- 
Maxim Dounin
http://mdounin.ru/