netdev - [RFC 0/2] Shrink page_frag

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Message-Id: <20180315195329.7787-1-willy@infradead.org>
Date:   Thu, 15 Mar 2018 12:53:27 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     Alexander Duyck <alexander.h.duyck@...el.com>
Cc:     linux-mm@...r.kernel.org, netdev@...r.kernel.org,
        Matthew Wilcox <mawilcox@...rosoft.com>
Subject: [RFC 0/2] Shrink page_frag_cache

From: Matthew Wilcox <mawilcox@...rosoft.com>

I've just learned about the page_frag_cache allocator, and now I want
to use it everywhere ;-)

But before I start using it in other places, I want to see if it can
be improved at all.  The pfmemalloc flag is pretty specific to how the
network stack uses it (with GFP_ATOMIC), and the pagecnt_bias is tricky
to understand.  I think we can do better by just using the fields in
struct page directly.  I don't have a suitable setup for performance
testing this code ... Alex, is there any chance you'd have time to give
this a spin?

Matthew Wilcox (2):
  mm: Use page->mapping to indicate pfmemalloc
  page_frag_cache: Store metadata in struct page

 include/linux/mm.h       |  16 ++----
 include/linux/mm_types.h |  17 +-----
 mm/page_alloc.c          | 143 ++++++++++++++++++++++++-----------------------
 net/core/skbuff.c        |   4 +-
 4 files changed, 82 insertions(+), 98 deletions(-)

-- 
2.16.2