Re: [PATCH v5 1/2] lib: stackdepot: Add support to configure STACK_HASH_SIZE

From: Minchan Kim
Date: Thu Jan 21 2021 - 19:20:12 EST

On Mon, Jan 18, 2021 at 03:26:41PM +0530, vjitta@xxxxxxxxxxxxxx wrote:
> From: Yogesh Lal <ylal@xxxxxxxxxxxxxx>
> Aim is to have configurable value for STACK_HASH_SIZE,
> so depend on use case one can configure it.
> One example is of Page Owner, default value of
> STACK_HASH_SIZE lead stack depot to consume 8MB of static memory.
> Making it configurable and use lower value helps to enable features like
> CONFIG_PAGE_OWNER without any significant overhead.

The description could be improved to prevent confusing.
CONFIG_PAGE_OWNER works only if page_owner=on via kernel parameter
on CONFIG_PAGE_OWNER configured system.
Thus, unless admin enable it via command line option, the stackdepot
will just waste 8M memory without any customer.

> Signed-off-by: Yogesh Lal <ylal@xxxxxxxxxxxxxx>
> Signed-off-by: Vinayak Menon <vinmenon@xxxxxxxxxxxxxx>
> Signed-off-by: Vijayanand Jitta <vjitta@xxxxxxxxxxxxxx>
Reviewed-by: Minchan Kim <minchan@xxxxxxxxxx>