2022-08-18 05:06:41

by Ritesh Harjani (IBM)

[permalink] [raw]
Subject: Re: [PATCH v2 1/4] Make place for common balloon code

On 22/08/16 12:41PM, Alexander Atanasov wrote:
> File already contains code that is common along balloon
> drivers so rename it to reflect its contents.
> mm/balloon_compaction.c -> mm/balloon_common.c
>
> Signed-off-by: Alexander Atanasov <[email protected]>
> ---
> MAINTAINERS | 4 ++--
> arch/powerpc/platforms/pseries/cmm.c | 2 +-
> drivers/misc/vmw_balloon.c | 2 +-
> drivers/virtio/virtio_balloon.c | 2 +-
> include/linux/{balloon_compaction.h => balloon_common.h} | 2 +-
> mm/Makefile | 2 +-
> mm/{balloon_compaction.c => balloon_common.c} | 4 ++--

> mm/migrate.c | 2 +-
> mm/vmscan.c | 2 +-
I think we don't need balloon headers in above two files at all.
I don't see any references of balloon functions in them.

I guess this commit removed it -

commit b1123ea6d3b3da25af5c8a9d843bd07ab63213f4
Author: Minchan Kim <[email protected]>
Date: Tue Jul 26 15:23:09 2016 -0700

mm: balloon: use general non-lru movable page feature

Now, VM has a feature to migrate non-lru movable pages so balloon
doesn't need custom migration hooks in migrate.c and compaction.c.

Instead, this patch implements the page->mapping->a_ops->
{isolate|migrate|putback} functions.

With that, we could remove hooks for ballooning in general migration
functions and make balloon compaction simple.

Since I don't often look into this side of code, it's better to confirm :)

-ritesh


2022-08-18 07:19:35

by Alexander Atanasov

[permalink] [raw]
Subject: Re: [PATCH v2 1/4] Make place for common balloon code

Hello,

On 18.08.22 7:41, Ritesh Harjani wrote:
> On 22/08/16 12:41PM, Alexander Atanasov wrote:
>> File already contains code that is common along balloon
>> drivers so rename it to reflect its contents.
>> mm/balloon_compaction.c -> mm/balloon_common.c
>>
>> Signed-off-by: Alexander Atanasov <[email protected]>
>> ---
>> MAINTAINERS | 4 ++--
>> arch/powerpc/platforms/pseries/cmm.c | 2 +-
>> drivers/misc/vmw_balloon.c | 2 +-
>> drivers/virtio/virtio_balloon.c | 2 +-
>> include/linux/{balloon_compaction.h => balloon_common.h} | 2 +-
>> mm/Makefile | 2 +-
>> mm/{balloon_compaction.c => balloon_common.c} | 4 ++--
>
>> mm/migrate.c | 2 +-
>> mm/vmscan.c | 2 +-
> I think we don't need balloon headers in above two files at all.
> I don't see any references of balloon functions in them.

...

> Since I don't often look into this side of code, it's better to confirm :)

Yes, you are right. It passed a visual and compile verification.
I will remove them in the next iteration. Thanks for pointing it out :)

--
Regards,
Alexander Atanasov