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4835f747d3
Implement support for storing page allocation tag references directly in the page flags instead of page extensions. sysctl.vm.mem_profiling boot parameter it extended to provide a way for a user to request this mode. Enabling compression eliminates memory overhead caused by page_ext and results in better performance for page allocations. However this mode will not work if the number of available page flag bits is insufficient to address all kernel allocations. Such condition can happen during boot or when loading a module. If this condition is detected, memory allocation profiling gets disabled with an appropriate warning. By default compression mode is disabled. Link: https://lkml.kernel.org/r/20241023170759.999909-7-surenb@google.com Signed-off-by: Suren Baghdasaryan <surenb@google.com> Reviewed-by: Pasha Tatashin <pasha.tatashin@soleen.com> Cc: Ard Biesheuvel <ardb@kernel.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Borislav Petkov (AMD) <bp@alien8.de> Cc: Christoph Hellwig <hch@infradead.org> Cc: Daniel Gomez <da.gomez@samsung.com> Cc: David Hildenbrand <david@redhat.com> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: David Rientjes <rientjes@google.com> Cc: Dennis Zhou <dennis@kernel.org> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: John Hubbard <jhubbard@nvidia.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Kalesh Singh <kaleshsingh@google.com> Cc: Kees Cook <keescook@chromium.org> Cc: Kent Overstreet <kent.overstreet@linux.dev> Cc: Liam R. Howlett <Liam.Howlett@Oracle.com> Cc: Luis Chamberlain <mcgrof@kernel.org> Cc: Matthew Wilcox <willy@infradead.org> Cc: Michal Hocko <mhocko@suse.com> Cc: Mike Rapoport (Microsoft) <rppt@kernel.org> Cc: Minchan Kim <minchan@google.com> Cc: Paul E. McKenney <paulmck@kernel.org> Cc: Petr Pavlu <petr.pavlu@suse.com> Cc: Roman Gushchin <roman.gushchin@linux.dev> Cc: Sami Tolvanen <samitolvanen@google.com> Cc: Sourav Panda <souravpanda@google.com> Cc: Steven Rostedt (Google) <rostedt@goodmis.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Thomas Huth <thuth@redhat.com> Cc: Uladzislau Rezki (Sony) <urezki@gmail.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Xiongwei Song <xiongwei.song@windriver.com> Cc: Yu Zhao <yuzhao@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
123 lines
3.7 KiB
C
123 lines
3.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef PAGE_FLAGS_LAYOUT_H
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#define PAGE_FLAGS_LAYOUT_H
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#include <linux/numa.h>
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#include <generated/bounds.h>
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/*
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* When a memory allocation must conform to specific limitations (such
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* as being suitable for DMA) the caller will pass in hints to the
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* allocator in the gfp_mask, in the zone modifier bits. These bits
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* are used to select a priority ordered list of memory zones which
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* match the requested limits. See gfp_zone() in include/linux/gfp.h
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*/
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#if MAX_NR_ZONES < 2
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#define ZONES_SHIFT 0
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#elif MAX_NR_ZONES <= 2
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#define ZONES_SHIFT 1
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#elif MAX_NR_ZONES <= 4
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#define ZONES_SHIFT 2
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#elif MAX_NR_ZONES <= 8
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#define ZONES_SHIFT 3
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#else
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#error ZONES_SHIFT "Too many zones configured"
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#endif
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#define ZONES_WIDTH ZONES_SHIFT
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#ifdef CONFIG_SPARSEMEM
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#include <asm/sparsemem.h>
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#define SECTIONS_SHIFT (MAX_PHYSMEM_BITS - SECTION_SIZE_BITS)
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#else
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#define SECTIONS_SHIFT 0
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#endif
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#ifndef BUILD_VDSO32_64
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/*
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* page->flags layout:
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*
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* There are five possibilities for how page->flags get laid out. The first
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* pair is for the normal case without sparsemem. The second pair is for
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* sparsemem when there is plenty of space for node and section information.
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* The last is when there is insufficient space in page->flags and a separate
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* lookup is necessary.
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*
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* No sparsemem or sparsemem vmemmap: | NODE | ZONE | ... | FLAGS |
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* " plus space for last_cpupid: | NODE | ZONE | LAST_CPUPID ... | FLAGS |
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* classic sparse with space for node:| SECTION | NODE | ZONE | ... | FLAGS |
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* " plus space for last_cpupid: | SECTION | NODE | ZONE | LAST_CPUPID ... | FLAGS |
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* classic sparse no space for node: | SECTION | ZONE | ... | FLAGS |
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*/
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#if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
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#define SECTIONS_WIDTH SECTIONS_SHIFT
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#else
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#define SECTIONS_WIDTH 0
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#endif
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#if ZONES_WIDTH + LRU_GEN_WIDTH + SECTIONS_WIDTH + NODES_SHIFT \
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<= BITS_PER_LONG - NR_PAGEFLAGS
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#define NODES_WIDTH NODES_SHIFT
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#elif defined(CONFIG_SPARSEMEM_VMEMMAP)
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#error "Vmemmap: No space for nodes field in page flags"
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#else
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#define NODES_WIDTH 0
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#endif
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/*
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* Note that this #define MUST have a value so that it can be tested with
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* the IS_ENABLED() macro.
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*/
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#if NODES_SHIFT != 0 && NODES_WIDTH == 0
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#define NODE_NOT_IN_PAGE_FLAGS 1
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#endif
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#if defined(CONFIG_KASAN_SW_TAGS) || defined(CONFIG_KASAN_HW_TAGS)
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#define KASAN_TAG_WIDTH 8
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#else
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#define KASAN_TAG_WIDTH 0
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#endif
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#ifdef CONFIG_NUMA_BALANCING
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#define LAST__PID_SHIFT 8
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#define LAST__PID_MASK ((1 << LAST__PID_SHIFT)-1)
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#define LAST__CPU_SHIFT NR_CPUS_BITS
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#define LAST__CPU_MASK ((1 << LAST__CPU_SHIFT)-1)
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#define LAST_CPUPID_SHIFT (LAST__PID_SHIFT+LAST__CPU_SHIFT)
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#else
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#define LAST_CPUPID_SHIFT 0
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#endif
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#if ZONES_WIDTH + LRU_GEN_WIDTH + SECTIONS_WIDTH + NODES_WIDTH + \
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KASAN_TAG_WIDTH + LAST_CPUPID_SHIFT <= BITS_PER_LONG - NR_PAGEFLAGS
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#define LAST_CPUPID_WIDTH LAST_CPUPID_SHIFT
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#else
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#define LAST_CPUPID_WIDTH 0
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#endif
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#if LAST_CPUPID_SHIFT != 0 && LAST_CPUPID_WIDTH == 0
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#define LAST_CPUPID_NOT_IN_PAGE_FLAGS
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#endif
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#if ZONES_WIDTH + LRU_GEN_WIDTH + SECTIONS_WIDTH + NODES_WIDTH + \
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KASAN_TAG_WIDTH + LAST_CPUPID_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
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#error "Not enough bits in page flags"
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#endif
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/* see the comment on MAX_NR_TIERS */
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#define LRU_REFS_WIDTH min(__LRU_REFS_WIDTH, BITS_PER_LONG - NR_PAGEFLAGS - \
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ZONES_WIDTH - LRU_GEN_WIDTH - SECTIONS_WIDTH - \
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NODES_WIDTH - KASAN_TAG_WIDTH - LAST_CPUPID_WIDTH)
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#define NR_NON_PAGEFLAG_BITS (SECTIONS_WIDTH + NODES_WIDTH + ZONES_WIDTH + \
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LAST_CPUPID_SHIFT + KASAN_TAG_WIDTH + \
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LRU_GEN_WIDTH + LRU_REFS_WIDTH)
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#define NR_UNUSED_PAGEFLAG_BITS (BITS_PER_LONG - \
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(NR_NON_PAGEFLAG_BITS + NR_PAGEFLAGS))
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#endif
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#endif /* _LINUX_PAGE_FLAGS_LAYOUT */
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