[lkml]   [2018]   [Oct]   [31]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH 2/3] mm: add mm_pxd_folded checks to pgtable_bytes accounting functions
On Mon, Oct 15, 2018 at 06:42:38PM +0200, Martin Schwidefsky wrote:
> The common mm code calls mm_dec_nr_pmds() and mm_dec_nr_puds()
> in free_pgtables() if the address range spans a full pud or pmd.
> If mm_dec_nr_puds/mm_dec_nr_pmds are non-empty due to configuration
> settings they blindly subtract the size of the pmd or pud table from
> pgtable_bytes even if the pud or pmd page table layer is folded.
> Add explicit mm_[pmd|pud]_folded checks to the four pgtable_bytes
> accounting functions mm_inc_nr_puds, mm_inc_nr_pmds, mm_dec_nr_puds
> and mm_dec_nr_pmds. As the check for folded page tables can be
> overwritten by the architecture, this allows to keep a correct
> pgtable_bytes value for platforms that use a dynamic number of
> page table levels.
> Signed-off-by: Martin Schwidefsky <>

Looks fine to me.

Acked-by: Kirill A. Shutemov <>

Kirill A. Shutemov

 \ /
  Last update: 2018-10-31 10:04    [W:0.085 / U:0.056 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site