From: Michal Hocko <mhocko@suse.com>
To: Suren Baghdasaryan <surenb@google.com>
Cc: akpm@linux-foundation.org, kent.overstreet@linux.dev,
vbabka@suse.cz, hannes@cmpxchg.org, roman.gushchin@linux.dev,
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"Petr Tesařík" <petr@tesarici.cz>
Subject: Re: [PATCH v4 06/36] mm: enumerate all gfp flags
Date: Thu, 22 Feb 2024 13:12:29 +0100 [thread overview]
Message-ID: <Zdc6LUWnPOBRmtZH@tiehlicka> (raw)
In-Reply-To: <20240221194052.927623-7-surenb@google.com>
On Wed 21-02-24 11:40:19, Suren Baghdasaryan wrote:
> Introduce GFP bits enumeration to let compiler track the number of used
> bits (which depends on the config options) instead of hardcoding them.
> That simplifies __GFP_BITS_SHIFT calculation.
>
> Suggested-by: Petr Tesařík <petr@tesarici.cz>
> Signed-off-by: Suren Baghdasaryan <surenb@google.com>
> Reviewed-by: Kees Cook <keescook@chromium.org>
I thought I have responded to this patch but obviously not the case.
I like this change. Makes sense even without the rest of the series.
Acked-by: Michal Hocko <mhocko@suse.com>
It seems that KASAN flags already __GFP_BITS_SHIFT which just proves how
fragile this existing scheme is.
> ---
> include/linux/gfp_types.h | 90 +++++++++++++++++++++++++++------------
> 1 file changed, 62 insertions(+), 28 deletions(-)
>
> diff --git a/include/linux/gfp_types.h b/include/linux/gfp_types.h
> index 1b6053da8754..868c8fb1bbc1 100644
> --- a/include/linux/gfp_types.h
> +++ b/include/linux/gfp_types.h
> @@ -21,44 +21,78 @@ typedef unsigned int __bitwise gfp_t;
> * include/trace/events/mmflags.h and tools/perf/builtin-kmem.c
> */
>
> +enum {
> + ___GFP_DMA_BIT,
> + ___GFP_HIGHMEM_BIT,
> + ___GFP_DMA32_BIT,
> + ___GFP_MOVABLE_BIT,
> + ___GFP_RECLAIMABLE_BIT,
> + ___GFP_HIGH_BIT,
> + ___GFP_IO_BIT,
> + ___GFP_FS_BIT,
> + ___GFP_ZERO_BIT,
> + ___GFP_UNUSED_BIT, /* 0x200u unused */
> + ___GFP_DIRECT_RECLAIM_BIT,
> + ___GFP_KSWAPD_RECLAIM_BIT,
> + ___GFP_WRITE_BIT,
> + ___GFP_NOWARN_BIT,
> + ___GFP_RETRY_MAYFAIL_BIT,
> + ___GFP_NOFAIL_BIT,
> + ___GFP_NORETRY_BIT,
> + ___GFP_MEMALLOC_BIT,
> + ___GFP_COMP_BIT,
> + ___GFP_NOMEMALLOC_BIT,
> + ___GFP_HARDWALL_BIT,
> + ___GFP_THISNODE_BIT,
> + ___GFP_ACCOUNT_BIT,
> + ___GFP_ZEROTAGS_BIT,
> +#ifdef CONFIG_KASAN_HW_TAGS
> + ___GFP_SKIP_ZERO_BIT,
> + ___GFP_SKIP_KASAN_BIT,
> +#endif
> +#ifdef CONFIG_LOCKDEP
> + ___GFP_NOLOCKDEP_BIT,
> +#endif
> + ___GFP_LAST_BIT
> +};
> +
> /* Plain integer GFP bitmasks. Do not use this directly. */
> -#define ___GFP_DMA 0x01u
> -#define ___GFP_HIGHMEM 0x02u
> -#define ___GFP_DMA32 0x04u
> -#define ___GFP_MOVABLE 0x08u
> -#define ___GFP_RECLAIMABLE 0x10u
> -#define ___GFP_HIGH 0x20u
> -#define ___GFP_IO 0x40u
> -#define ___GFP_FS 0x80u
> -#define ___GFP_ZERO 0x100u
> +#define ___GFP_DMA BIT(___GFP_DMA_BIT)
> +#define ___GFP_HIGHMEM BIT(___GFP_HIGHMEM_BIT)
> +#define ___GFP_DMA32 BIT(___GFP_DMA32_BIT)
> +#define ___GFP_MOVABLE BIT(___GFP_MOVABLE_BIT)
> +#define ___GFP_RECLAIMABLE BIT(___GFP_RECLAIMABLE_BIT)
> +#define ___GFP_HIGH BIT(___GFP_HIGH_BIT)
> +#define ___GFP_IO BIT(___GFP_IO_BIT)
> +#define ___GFP_FS BIT(___GFP_FS_BIT)
> +#define ___GFP_ZERO BIT(___GFP_ZERO_BIT)
> /* 0x200u unused */
> -#define ___GFP_DIRECT_RECLAIM 0x400u
> -#define ___GFP_KSWAPD_RECLAIM 0x800u
> -#define ___GFP_WRITE 0x1000u
> -#define ___GFP_NOWARN 0x2000u
> -#define ___GFP_RETRY_MAYFAIL 0x4000u
> -#define ___GFP_NOFAIL 0x8000u
> -#define ___GFP_NORETRY 0x10000u
> -#define ___GFP_MEMALLOC 0x20000u
> -#define ___GFP_COMP 0x40000u
> -#define ___GFP_NOMEMALLOC 0x80000u
> -#define ___GFP_HARDWALL 0x100000u
> -#define ___GFP_THISNODE 0x200000u
> -#define ___GFP_ACCOUNT 0x400000u
> -#define ___GFP_ZEROTAGS 0x800000u
> +#define ___GFP_DIRECT_RECLAIM BIT(___GFP_DIRECT_RECLAIM_BIT)
> +#define ___GFP_KSWAPD_RECLAIM BIT(___GFP_KSWAPD_RECLAIM_BIT)
> +#define ___GFP_WRITE BIT(___GFP_WRITE_BIT)
> +#define ___GFP_NOWARN BIT(___GFP_NOWARN_BIT)
> +#define ___GFP_RETRY_MAYFAIL BIT(___GFP_RETRY_MAYFAIL_BIT)
> +#define ___GFP_NOFAIL BIT(___GFP_NOFAIL_BIT)
> +#define ___GFP_NORETRY BIT(___GFP_NORETRY_BIT)
> +#define ___GFP_MEMALLOC BIT(___GFP_MEMALLOC_BIT)
> +#define ___GFP_COMP BIT(___GFP_COMP_BIT)
> +#define ___GFP_NOMEMALLOC BIT(___GFP_NOMEMALLOC_BIT)
> +#define ___GFP_HARDWALL BIT(___GFP_HARDWALL_BIT)
> +#define ___GFP_THISNODE BIT(___GFP_THISNODE_BIT)
> +#define ___GFP_ACCOUNT BIT(___GFP_ACCOUNT_BIT)
> +#define ___GFP_ZEROTAGS BIT(___GFP_ZEROTAGS_BIT)
> #ifdef CONFIG_KASAN_HW_TAGS
> -#define ___GFP_SKIP_ZERO 0x1000000u
> -#define ___GFP_SKIP_KASAN 0x2000000u
> +#define ___GFP_SKIP_ZERO BIT(___GFP_SKIP_ZERO_BIT)
> +#define ___GFP_SKIP_KASAN BIT(___GFP_SKIP_KASAN_BIT)
> #else
> #define ___GFP_SKIP_ZERO 0
> #define ___GFP_SKIP_KASAN 0
> #endif
> #ifdef CONFIG_LOCKDEP
> -#define ___GFP_NOLOCKDEP 0x4000000u
> +#define ___GFP_NOLOCKDEP BIT(___GFP_NOLOCKDEP_BIT)
> #else
> #define ___GFP_NOLOCKDEP 0
> #endif
> -/* If the above are modified, __GFP_BITS_SHIFT may need updating */
>
> /*
> * Physical address zone modifiers (see linux/mmzone.h - low four bits)
> @@ -249,7 +283,7 @@ typedef unsigned int __bitwise gfp_t;
> #define __GFP_NOLOCKDEP ((__force gfp_t)___GFP_NOLOCKDEP)
>
> /* Room for N __GFP_FOO bits */
> -#define __GFP_BITS_SHIFT (26 + IS_ENABLED(CONFIG_LOCKDEP))
> +#define __GFP_BITS_SHIFT ___GFP_LAST_BIT
> #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1))
>
> /**
> --
> 2.44.0.rc0.258.g7320e95886-goog
--
Michal Hocko
SUSE Labs
next prev parent reply other threads:[~2024-02-22 12:12 UTC|newest]
Thread overview: 97+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-21 19:40 [PATCH v4 00/36] Memory allocation profiling Suren Baghdasaryan
2024-02-21 19:40 ` [PATCH v4 01/36] fix missing vmalloc.h includes Suren Baghdasaryan
2024-02-21 21:09 ` Pasha Tatashin
2024-02-21 19:40 ` [PATCH v4 02/36] asm-generic/io.h: Kill vmalloc.h dependency Suren Baghdasaryan
2024-02-21 21:11 ` Pasha Tatashin
2024-02-21 19:40 ` [PATCH v4 03/36] mm/slub: Mark slab_free_freelist_hook() __always_inline Suren Baghdasaryan
2024-02-21 21:15 ` Pasha Tatashin
2024-02-24 2:02 ` Suren Baghdasaryan
2024-02-26 14:31 ` Vlastimil Babka
[not found] ` <CA+CK2bBggtq6M96Pu49BmG_j01Sv6p_84Go++9APuvVPXHMwvQ@mail.gmail.com>
2024-02-26 16:09 ` Suren Baghdasaryan
2024-02-21 19:40 ` [PATCH v4 04/36] scripts/kallysms: Always include __start and __stop symbols Suren Baghdasaryan
2024-02-21 21:20 ` Pasha Tatashin
2024-02-21 19:40 ` [PATCH v4 05/36] fs: Convert alloc_inode_sb() to a macro Suren Baghdasaryan
2024-02-21 21:23 ` Pasha Tatashin
2024-02-26 15:44 ` Vlastimil Babka
2024-02-26 17:48 ` Suren Baghdasaryan
2024-02-26 20:50 ` Kent Overstreet
2024-02-21 19:40 ` [PATCH v4 06/36] mm: enumerate all gfp flags Suren Baghdasaryan
2024-02-21 21:25 ` Pasha Tatashin
2024-02-22 12:12 ` Michal Hocko [this message]
2024-02-22 12:24 ` Petr Tesařík
2024-02-23 19:26 ` Suren Baghdasaryan
2024-02-24 1:59 ` Suren Baghdasaryan
2024-02-21 19:40 ` [PATCH v4 07/36] mm: introduce slabobj_ext to support slab object extensions Suren Baghdasaryan
2024-02-21 21:30 ` Pasha Tatashin
2024-02-26 16:26 ` Vlastimil Babka
2024-02-26 17:22 ` Suren Baghdasaryan
2024-02-21 19:40 ` [PATCH v4 08/36] mm: introduce __GFP_NO_OBJ_EXT flag to selectively prevent slabobj_ext creation Suren Baghdasaryan
2024-02-22 0:08 ` Pasha Tatashin
2024-02-26 16:51 ` Vlastimil Babka
2024-02-21 19:40 ` [PATCH v4 09/36] mm/slab: introduce SLAB_NO_OBJ_EXT to avoid obj_ext creation Suren Baghdasaryan
2024-02-22 0:09 ` Pasha Tatashin
2024-02-26 16:52 ` Vlastimil Babka
2024-02-21 19:40 ` [PATCH v4 10/36] slab: objext: introduce objext_flags as extension to page_memcg_data_flags Suren Baghdasaryan
2024-02-22 0:12 ` Pasha Tatashin
2024-02-26 16:53 ` Vlastimil Babka
2024-02-21 19:40 ` [PATCH v4 11/36] lib: code tagging framework Suren Baghdasaryan
2024-02-21 19:40 ` [PATCH v4 12/36] lib: code tagging module support Suren Baghdasaryan
2024-02-21 19:40 ` [PATCH v4 13/36] lib: prevent module unloading if memory is not freed Suren Baghdasaryan
2024-02-26 16:58 ` Vlastimil Babka
2024-02-26 17:13 ` Suren Baghdasaryan
2024-03-12 18:23 ` Luis Chamberlain
2024-03-12 19:56 ` Suren Baghdasaryan
2024-03-12 20:07 ` Kent Overstreet
2024-02-21 19:40 ` [PATCH v4 14/36] lib: add allocation tagging support for memory allocation profiling Suren Baghdasaryan
2024-02-21 23:05 ` Kees Cook
2024-02-21 23:29 ` Kent Overstreet
2024-02-22 0:25 ` Kees Cook
2024-02-22 0:34 ` Kent Overstreet
2024-02-22 0:57 ` Kees Cook
2024-02-28 8:29 ` Vlastimil Babka
2024-02-28 18:05 ` Suren Baghdasaryan
2024-02-28 8:41 ` Vlastimil Babka
2024-02-28 18:07 ` Suren Baghdasaryan
2024-02-21 19:40 ` [PATCH v4 15/36] lib: introduce support for page allocation tagging Suren Baghdasaryan
2024-02-26 17:07 ` Vlastimil Babka
2024-02-26 17:11 ` Suren Baghdasaryan
2024-02-27 9:30 ` Vlastimil Babka
2024-02-27 9:45 ` Kent Overstreet
2024-02-27 16:55 ` Suren Baghdasaryan
2024-02-21 19:40 ` [PATCH v4 16/36] mm: percpu: increase PERCPU_MODULE_RESERVE to accommodate allocation tags Suren Baghdasaryan
2024-02-21 19:40 ` [PATCH v4 17/36] change alloc_pages name in dma_map_ops to avoid name conflicts Suren Baghdasaryan
2024-02-21 19:40 ` [PATCH v4 18/36] mm: enable page allocation tagging Suren Baghdasaryan
2024-02-21 19:40 ` [PATCH v4 19/36] mm: create new codetag references during page splitting Suren Baghdasaryan
2024-02-27 10:11 ` Vlastimil Babka
2024-02-27 16:38 ` Suren Baghdasaryan
2024-02-28 8:47 ` Vlastimil Babka
2024-02-28 17:50 ` Suren Baghdasaryan
2024-02-28 18:28 ` Vlastimil Babka
2024-02-28 18:38 ` Suren Baghdasaryan
2024-02-21 19:40 ` [PATCH v4 20/36] mm/page_ext: enable early_page_ext when CONFIG_MEM_ALLOC_PROFILING_DEBUG=y Suren Baghdasaryan
2024-02-27 10:18 ` Vlastimil Babka
2024-02-21 19:40 ` [PATCH v4 21/36] lib: add codetag reference into slabobj_ext Suren Baghdasaryan
2024-02-27 10:19 ` Vlastimil Babka
2024-02-21 19:40 ` [PATCH v4 22/36] mm/slab: add allocation accounting into slab allocation and free paths Suren Baghdasaryan
2024-02-27 13:07 ` Vlastimil Babka
2024-02-27 16:15 ` Suren Baghdasaryan
2024-02-21 19:40 ` [PATCH v4 23/36] mm/slab: enable slab allocation tagging for kmalloc and friends Suren Baghdasaryan
2024-02-21 19:40 ` [PATCH v4 24/36] rust: Add a rust helper for krealloc() Suren Baghdasaryan
2024-02-22 9:59 ` Alice Ryhl
2024-02-23 22:17 ` Suren Baghdasaryan
2024-02-21 19:40 ` [PATCH v4 25/36] mempool: Hook up to memory allocation profiling Suren Baghdasaryan
2024-02-21 19:40 ` [PATCH v4 26/36] mm: percpu: Introduce pcpuobj_ext Suren Baghdasaryan
2024-02-21 19:40 ` [PATCH v4 27/36] mm: percpu: Add codetag reference into pcpuobj_ext Suren Baghdasaryan
2024-02-21 19:40 ` [PATCH v4 28/36] mm: percpu: enable per-cpu allocation tagging Suren Baghdasaryan
2024-02-21 19:40 ` [PATCH v4 29/36] mm: vmalloc: Enable memory allocation profiling Suren Baghdasaryan
2024-02-21 19:40 ` [PATCH v4 30/36] rhashtable: Plumb through alloc tag Suren Baghdasaryan
2024-02-21 19:40 ` [PATCH v4 31/36] lib: add memory allocations report in show_mem() Suren Baghdasaryan
2024-02-27 13:19 ` Vlastimil Babka
2024-02-27 16:12 ` Suren Baghdasaryan
2024-02-21 19:40 ` [PATCH v4 32/36] codetag: debug: skip objext checking when it's for objext itself Suren Baghdasaryan
2024-02-21 19:40 ` [PATCH v4 33/36] codetag: debug: mark codetags for reserved pages as empty Suren Baghdasaryan
2024-02-21 19:40 ` [PATCH v4 34/36] codetag: debug: introduce OBJEXTS_ALLOC_FAIL to mark failed slab_ext allocations Suren Baghdasaryan
2024-02-21 19:40 ` [PATCH v4 35/36] MAINTAINERS: Add entries for code tagging and memory allocation profiling Suren Baghdasaryan
2024-02-21 19:40 ` [PATCH v4 36/36] memprofiling: Documentation Suren Baghdasaryan
2024-02-27 13:36 ` [PATCH v4 00/36] Memory allocation profiling Vlastimil Babka
2024-02-27 16:10 ` Suren Baghdasaryan
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