Re: [PATCH v2 0/4] Remove nrexceptional tracking

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Ping?

On Thu, Jan 21, 2021 at 06:43:34PM +0000, Matthew Wilcox wrote:
> Ping?  These patches still apply to next-20210121.
> 
> On Mon, Oct 26, 2020 at 03:18:45PM +0000, Matthew Wilcox (Oracle) wrote:
> > We actually use nrexceptional for very little these days.  It's a minor
> > pain to keep in sync with nrpages, but the pain becomes much bigger
> > with the THP patches because we don't know how many indices a shadow
> > entry occupies.  It's easier to just remove it than keep it accurate.
> > 
> > Also, we save 8 bytes per inode which is nothing to sneeze at; on my
> > laptop, it would improve shmem_inode_cache from 22 to 23 objects per
> > 16kB, and inode_cache from 26 to 27 objects.  Combined, that saves
> > a megabyte of memory from a combined usage of 25MB for both caches.
> > Unfortunately, ext4 doesn't cross a magic boundary, so it doesn't save
> > any memory for ext4.
> > 
> > Matthew Wilcox (Oracle) (4):
> >   mm: Introduce and use mapping_empty
> >   mm: Stop accounting shadow entries
> >   dax: Account DAX entries as nrpages
> >   mm: Remove nrexceptional from inode
> > 
> >  fs/block_dev.c          |  2 +-
> >  fs/dax.c                |  8 ++++----
> >  fs/gfs2/glock.c         |  3 +--
> >  fs/inode.c              |  2 +-
> >  include/linux/fs.h      |  2 --
> >  include/linux/pagemap.h |  5 +++++
> >  mm/filemap.c            | 16 ----------------
> >  mm/swap_state.c         |  4 ----
> >  mm/truncate.c           | 19 +++----------------
> >  mm/workingset.c         |  1 -
> >  10 files changed, 15 insertions(+), 47 deletions(-)
> > 
> > -- 
> > 2.28.0
> > 
> 




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