On Tue, Nov 19, 2019 at 01:47:41PM +0300, Kirill A. Shutemov wrote:
> On Mon, Nov 18, 2019 at 10:01:02PM -0500, Rafael Aquini wrote:
> > Documentation/admin-guide/mm/transhuge.rst (originally in Documentation/vm/transhuge.txt)
> > states that TRANSPARENT_HUGEPAGE_MADVISE is the default option for THP config:
> >
> > "
> > madvise
> > will enter direct reclaim like ``always`` but only for regions
> > that are have used madvise(MADV_HUGEPAGE). This is the default
> > behaviour.
> > "
> >
> > This patch changes mm/Kconfig to reflect that fact, accordingly.
>
> No. You've read it incorrectly.
>
Fair enough.
I'll reform the log message then, and repost.
> The documentation describes default behaviour wrt defragmentaton ("defrag"
> file), not page fault ("enabled" file). We don't have any Kconfig option
> to set default behaviour for "defrag".
>
> > Besides keeping consistency between documentation and the code behavior,
> > other reasons to perform this minor adjustment are noted at:
> > https://bugzilla.redhat.com/show_bug.cgi?id=1772133
> >
> > Signed-off-by: Rafael Aquini <aquini@xxxxxxxxxx>
> > ---
> > mm/Kconfig | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/mm/Kconfig b/mm/Kconfig
> > index a5dae9a7eb51..c12a559aa1e5 100644
> > --- a/mm/Kconfig
> > +++ b/mm/Kconfig
> > @@ -385,7 +385,7 @@ config TRANSPARENT_HUGEPAGE
> > choice
> > prompt "Transparent Hugepage Support sysfs defaults"
> > depends on TRANSPARENT_HUGEPAGE
> > - default TRANSPARENT_HUGEPAGE_ALWAYS
> > + default TRANSPARENT_HUGEPAGE_MADVISE
> > help
> > Selects the sysfs defaults for Transparent Hugepage Support.
> >
> > --
> > 2.17.2
> >
> >
>
> --
> Kirill A. Shutemov
>
