From: Matthew Wilcox <willy@infradead.org>
To: Andrew Morton <akpm@linux-foundation.org>, linux-mm@kvack.org
Cc: linux-fsdevel@vger.kernel.org, linux-nvdimm@lists.01.org
Subject: Re: [PATCH v2 0/4] Remove nrexceptional tracking
Date: Sat, 13 Mar 2021 02:35:21 +0000 [thread overview]
Message-ID: <20210313023521.GG2577561@casper.infradead.org> (raw)
In-Reply-To: <20210121184334.GA4127393@casper.infradead.org>
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
> >
>
next prev parent reply other threads:[~2021-03-13 2:36 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-26 15:18 [PATCH v2 0/4] Remove nrexceptional tracking Matthew Wilcox (Oracle)
2020-10-26 15:18 ` [PATCH v2 1/4] mm: Introduce and use mapping_empty Matthew Wilcox (Oracle)
2021-01-21 20:42 ` Johannes Weiner
2021-01-21 21:18 ` Matthew Wilcox
2020-10-26 15:18 ` [PATCH v2 2/4] mm: Stop accounting shadow entries Matthew Wilcox (Oracle)
2021-01-21 20:44 ` Johannes Weiner
2020-10-26 15:18 ` [PATCH v2 3/4] dax: Account DAX entries as nrpages Matthew Wilcox (Oracle)
2021-01-21 20:46 ` Johannes Weiner
2020-10-26 15:18 ` [PATCH v2 4/4] mm: Remove nrexceptional from inode Matthew Wilcox (Oracle)
2021-01-21 20:47 ` Johannes Weiner
2021-01-21 18:43 ` [PATCH v2 0/4] Remove nrexceptional tracking Matthew Wilcox
2021-03-13 2:35 ` Matthew Wilcox [this message]
2021-01-22 19:38 ` William Kucharski
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