[RFC 0/2] Shrink page_frag_cache

Matthew Wilcox
2018-03-15T19:53:32Z

From: Matthew Wilcox <mawilcox@microsoft.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(-)

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2.16.2