linux-kernel - Re: [PATCH 09/16] iommu/iommufd: use page allocation function provided by iommu-pages.h

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Date:   Wed, 29 Nov 2023 16:59:43 -0500
From:   Pasha Tatashin <pasha.tatashin@...een.com>
To:     Jason Gunthorpe <jgg@...pe.ca>
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Subject: Re: [PATCH 09/16] iommu/iommufd: use page allocation function
 provided by iommu-pages.h

On Tue, Nov 28, 2023 at 6:52 PM Jason Gunthorpe <jgg@...pe.ca> wrote:
>
> On Tue, Nov 28, 2023 at 08:49:31PM +0000, Pasha Tatashin wrote:
> > Convert iommu/iommufd/* files to use the new page allocation functions
> > provided in iommu-pages.h.
> >
> > Signed-off-by: Pasha Tatashin <pasha.tatashin@...een.com>
> > ---
> >  drivers/iommu/iommufd/iova_bitmap.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
>
> This is a short term allocation, it should not be counted, that is why
> it is already not using GFP_KERNEL_ACCOUNT.

I made this change for completeness. I changed all calls to
get_free_page/alloc_page etc under driver/iommu to use the
iommu_alloc_* variants, this also helps future developers in this area
to use the right allocation functions.
The accounting is implemented using cheap per-cpu counters, so should
not affect the performance, I think it is OK to keep them here.