linux-kernel - Re: [PATCH v2 14/46] mm/memcg: Add folio_charge

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Message-ID: <YNS2EvYub46WdVaq@casper.infradead.org>
Date:   Thu, 24 Jun 2021 17:42:58 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     akpm@...ux-foundation.org, linux-fsdevel@...r.kernel.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 14/46] mm/memcg: Add folio_charge_cgroup()

On Wed, Jun 23, 2021 at 10:15:20AM +0200, Christoph Hellwig wrote:
> On Tue, Jun 22, 2021 at 01:15:19PM +0100, Matthew Wilcox (Oracle) wrote:
> > mem_cgroup_charge() already assumed it was being passed a non-tail
> > page (and looking at the callers, that's true; it's called for freshly
> > allocated pages).  The only real change here is that folio_nr_pages()
> > doesn't compile away like thp_nr_pages() does as folio support
> > is not conditional on transparent hugepage support.  Reimplement
> > mem_cgroup_charge() as a wrapper around folio_charge_cgroup().
> 
> Maybe rename __mem_cgroup_charge to __folio_charge_cgroup as well?

Oh, yeah, should have done that.  Thanks.