2018-08-24 08:01:12 +08:00
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======================
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Memory Management APIs
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======================
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User Space Memory Access
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========================
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.. kernel-doc:: arch/x86/include/asm/uaccess.h
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:internal:
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.. kernel-doc:: arch/x86/lib/usercopy_32.c
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:export:
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2019-10-01 22:47:47 +08:00
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.. kernel-doc:: mm/gup.c
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2018-08-24 08:01:12 +08:00
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:functions: get_user_pages_fast
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2018-09-14 17:27:57 +08:00
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.. _mm-api-gfp-flags:
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2018-08-24 08:01:19 +08:00
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Memory Allocation Controls
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==========================
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2021-02-25 04:06:35 +08:00
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.. kernel-doc:: include/linux/gfp.h
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:internal:
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2018-08-24 08:01:19 +08:00
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.. kernel-doc:: include/linux/gfp.h
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:doc: Page mobility and placement hints
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.. kernel-doc:: include/linux/gfp.h
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:doc: Watermark modifiers
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.. kernel-doc:: include/linux/gfp.h
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:doc: Reclaim modifiers
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.. kernel-doc:: include/linux/gfp.h
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2019-01-15 02:32:58 +08:00
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:doc: Useful GFP flag combinations
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2018-08-24 08:01:19 +08:00
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2018-08-24 08:01:12 +08:00
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The Slab Cache
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==============
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.. kernel-doc:: include/linux/slab.h
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:internal:
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.. kernel-doc:: mm/slab.c
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:export:
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2018-12-07 05:13:01 +08:00
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.. kernel-doc:: mm/slab_common.c
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:export:
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2018-08-24 08:01:12 +08:00
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.. kernel-doc:: mm/util.c
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:functions: kfree_const kvmalloc_node kvfree
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2018-11-28 22:45:44 +08:00
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Virtually Contiguous Mappings
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=============================
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.. kernel-doc:: mm/vmalloc.c
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:export:
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File Mapping and Page Cache
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===========================
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2018-08-24 08:01:12 +08:00
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.. kernel-doc:: mm/readahead.c
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:export:
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.. kernel-doc:: mm/filemap.c
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:export:
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2018-11-28 22:45:44 +08:00
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.. kernel-doc:: mm/page-writeback.c
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2018-08-24 08:01:12 +08:00
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:export:
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2018-11-28 22:45:44 +08:00
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.. kernel-doc:: mm/truncate.c
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2018-08-24 08:01:12 +08:00
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:export:
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2020-04-02 12:07:55 +08:00
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.. kernel-doc:: include/linux/pagemap.h
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:internal:
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2018-11-28 22:45:44 +08:00
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Memory pools
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============
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2018-08-24 08:01:12 +08:00
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.. kernel-doc:: mm/mempool.c
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:export:
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2018-11-28 22:45:44 +08:00
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DMA pools
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=========
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2018-08-24 08:01:12 +08:00
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.. kernel-doc:: mm/dmapool.c
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:export:
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2018-11-28 22:45:44 +08:00
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More Memory Management Functions
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================================
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2018-08-24 08:01:12 +08:00
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2018-11-28 22:45:44 +08:00
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.. kernel-doc:: mm/memory.c
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2018-08-24 08:01:12 +08:00
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:export:
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2018-11-28 22:45:44 +08:00
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.. kernel-doc:: mm/page_alloc.c
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2021-04-30 14:01:27 +08:00
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.. kernel-doc:: mm/mempolicy.c
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2021-04-30 13:59:34 +08:00
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.. kernel-doc:: include/linux/mm_types.h
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:internal:
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2021-02-25 22:47:41 +08:00
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.. kernel-doc:: include/linux/mm_inline.h
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2020-12-07 11:22:48 +08:00
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.. kernel-doc:: include/linux/page-flags.h
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2021-04-30 13:59:34 +08:00
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.. kernel-doc:: include/linux/mm.h
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:internal:
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2021-03-31 22:39:55 +08:00
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.. kernel-doc:: include/linux/page_ref.h
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2021-04-30 14:02:16 +08:00
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.. kernel-doc:: include/linux/mmzone.h
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mm/util: Add folio_mapping() and folio_file_mapping()
These are the folio equivalent of page_mapping() and page_file_mapping().
Add an out-of-line page_mapping() wrapper around folio_mapping()
in order to prevent the page_folio() call from bloating every caller
of page_mapping(). Adjust page_file_mapping() and page_mapping_file()
to use folios internally. Rename __page_file_mapping() to
swapcache_mapping() and change it to take a folio.
This ends up saving 122 bytes of text overall. folio_mapping() is
45 bytes shorter than page_mapping() was, but the new page_mapping()
wrapper is 30 bytes. The major reduction is a few bytes less in dozens
of nfs functions (which call page_file_mapping()). Most of these appear
to be a slight change in gcc's register allocation decisions, which allow:
48 8b 56 08 mov 0x8(%rsi),%rdx
48 8d 42 ff lea -0x1(%rdx),%rax
83 e2 01 and $0x1,%edx
48 0f 44 c6 cmove %rsi,%rax
to become:
48 8b 46 08 mov 0x8(%rsi),%rax
48 8d 78 ff lea -0x1(%rax),%rdi
a8 01 test $0x1,%al
48 0f 44 fe cmove %rsi,%rdi
for a reduction of a single byte. Once the NFS client is converted to
use folios, this entire sequence will disappear.
Also add folio_mapping() documentation.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Jeff Layton <jlayton@kernel.org>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: William Kucharski <william.kucharski@oracle.com>
Reviewed-by: David Howells <dhowells@redhat.com>
2020-12-10 23:55:05 +08:00
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.. kernel-doc:: mm/util.c
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:functions: folio_mapping
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