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mm/readahead: add DEFINE_READAHEAD

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Patch series "Readahead patches for 5.9/5.10".

These are infrastructure for both the THP patchset and for the fscache
rewrite,

For both pieces of infrastructure being build on top of this patchset, we
want the ractl to be available higher in the call-stack.

For David's work, he wants to add the 'critical page' to the ractl so that
he knows which page NEEDS to be brought in from storage, and which ones
are nice-to-have.  We might want something similar in block storage too.
It used to be simple -- the first page was the critical one, but then mmap
added fault-around and so for that usecase, the middle page is the
critical one.  Anyway, I don't have any code to show that yet, we just
know that the lowest point in the callchain where we have that information
is do_sync_mmap_readahead() and so the ractl needs to start its life
there.

For THP, we havew the code that needs it.  It's actually the apex patch to
the series; the one which finally starts to allocate THPs and present them
to consenting filesystems:
798bcf30ab

This patch (of 8):

Allow for a more concise definition of a struct readahead_control.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Eric Biggers <ebiggers@google.com>
Cc: David Howells <dhowells@redhat.com>
Link: https://lkml.kernel.org/r/20200903140844.14194-1-willy@infradead.org
Link: https://lkml.kernel.org/r/20200903140844.14194-3-willy@infradead.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2020-10-15 20:06:10 -07:00 committed by Linus Torvalds
parent c4f9c701f9
commit 1aa83cfa5a
2 changed files with 8 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
include/linux/pagemap.h
View File

@ -812,6 +812,13 @@ struct readahead_control {
unsigned int _batch_count;
};
#define DEFINE_READAHEAD(rac, f, m, i) \
struct readahead_control rac = { \
.file = f, \
.mapping = m, \
._index = i, \
}
/**
* readahead_page - Get the next page to read.
* @rac: The current readahead request.

6
mm/readahead.c
View File

@ -179,11 +179,7 @@ void page_cache_readahead_unbounded(struct address_space *mapping,
{
LIST_HEAD(page_pool);
gfp_t gfp_mask = readahead_gfp_mask(mapping);
struct readahead_control rac = {
.mapping = mapping,
.file = file,
._index = index,
};
DEFINE_READAHEAD(rac, file, mapping, index);
unsigned long i;
/*