From: Vlastimil Babka <vbabka@suse.cz>
To: Suren Baghdasaryan <surenb@google.com>, akpm@linux-foundation.org
Cc: kent.overstreet@linux.dev, mhocko@suse.com, hannes@cmpxchg.org,
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Subject: Re: [PATCH v5 15/37] lib: introduce early boot parameter to avoid page_ext memory overhead
Date: Wed, 13 Mar 2024 15:35:53 +0100 [thread overview]
Message-ID: <ef836dd3-0b65-485e-84a2-dd5cb9ecdff1@suse.cz> (raw)
In-Reply-To: <20240306182440.2003814-16-surenb@google.com>
On 3/6/24 19:24, Suren Baghdasaryan wrote:
> The highest memory overhead from memory allocation profiling comes from
> page_ext objects. This overhead exists even if the feature is disabled
> but compiled-in. To avoid it, introduce an early boot parameter that
> prevents page_ext object creation. The new boot parameter is a tri-state
> with possible values of 0|1|never. When it is set to "never" the
> memory allocation profiling support is disabled, and overhead is minimized
> (currently no page_ext objects are allocated, in the future more overhead
> might be eliminated). As a result we also lose ability to enable memory
> allocation profiling at runtime (because there is no space to store
> alloctag references). Runtime sysctrl becomes read-only if the early boot
> parameter was set to "never". Note that the default value of this boot
> parameter depends on the CONFIG_MEM_ALLOC_PROFILING_ENABLED_BY_DEFAULT
> configuration. When CONFIG_MEM_ALLOC_PROFILING_ENABLED_BY_DEFAULT=n
> the boot parameter is set to "never", therefore eliminating any overhead.
> CONFIG_MEM_ALLOC_PROFILING_ENABLED_BY_DEFAULT=y results in boot parameter
> being set to 1 (enabled). This allows distributions to avoid any overhead
> by setting CONFIG_MEM_ALLOC_PROFILING_ENABLED_BY_DEFAULT=n config and
> with no changes to the kernel command line.
> We reuse sysctl.vm.mem_profiling boot parameter name in order to avoid
> introducing yet another control. This change turns it into a tri-state
> early boot parameter.
>
> Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
next prev parent reply other threads:[~2024-03-13 14:35 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-06 18:23 [PATCH v5 00/37] Memory allocation profiling Suren Baghdasaryan
2024-03-06 18:23 ` [PATCH v5 01/37] fix missing vmalloc.h includes Suren Baghdasaryan
2024-03-06 18:24 ` [PATCH v5 02/37] asm-generic/io.h: Kill vmalloc.h dependency Suren Baghdasaryan
2024-03-06 18:24 ` [PATCH v5 03/37] mm/slub: Mark slab_free_freelist_hook() __always_inline Suren Baghdasaryan
2024-03-13 13:53 ` Vlastimil Babka
2024-03-06 18:24 ` [PATCH v5 04/37] scripts/kallysms: Always include __start and __stop symbols Suren Baghdasaryan
2024-03-06 18:24 ` [PATCH v5 05/37] fs: Convert alloc_inode_sb() to a macro Suren Baghdasaryan
2024-03-06 18:24 ` [PATCH v5 06/37] mm: introduce slabobj_ext to support slab object extensions Suren Baghdasaryan
2024-03-13 13:59 ` Vlastimil Babka
2024-03-06 18:24 ` [PATCH v5 07/37] mm: introduce __GFP_NO_OBJ_EXT flag to selectively prevent slabobj_ext creation Suren Baghdasaryan
2024-03-06 18:24 ` [PATCH v5 08/37] mm/slab: introduce SLAB_NO_OBJ_EXT to avoid obj_ext creation Suren Baghdasaryan
2024-03-06 18:24 ` [PATCH v5 09/37] slab: objext: introduce objext_flags as extension to page_memcg_data_flags Suren Baghdasaryan
2024-03-06 18:24 ` [PATCH v5 10/37] lib: code tagging framework Suren Baghdasaryan
2024-03-06 18:24 ` [PATCH v5 11/37] lib: code tagging module support Suren Baghdasaryan
2024-03-06 18:24 ` [PATCH v5 12/37] lib: prevent module unloading if memory is not freed Suren Baghdasaryan
2024-03-12 18:22 ` Luis Chamberlain
2024-03-12 18:41 ` Suren Baghdasaryan
2024-03-06 18:24 ` [PATCH v5 13/37] lib: add allocation tagging support for memory allocation profiling Suren Baghdasaryan
2024-03-06 18:24 ` [PATCH v5 14/37] lib: introduce support for page allocation tagging Suren Baghdasaryan
2024-03-15 14:24 ` Matthew Wilcox
2024-03-15 15:47 ` Suren Baghdasaryan
2024-03-06 18:24 ` [PATCH v5 15/37] lib: introduce early boot parameter to avoid page_ext memory overhead Suren Baghdasaryan
2024-03-13 14:35 ` Vlastimil Babka [this message]
2024-03-06 18:24 ` [PATCH v5 16/37] mm: percpu: increase PERCPU_MODULE_RESERVE to accommodate allocation tags Suren Baghdasaryan
2024-03-06 18:24 ` [PATCH v5 17/37] change alloc_pages name in dma_map_ops to avoid name conflicts Suren Baghdasaryan
2024-03-06 18:24 ` [PATCH v5 18/37] mm: enable page allocation tagging Suren Baghdasaryan
2024-03-06 18:24 ` [PATCH v5 19/37] mm: create new codetag references during page splitting Suren Baghdasaryan
2024-03-06 18:24 ` [PATCH v5 20/37] mm: fix non-compound multi-order memory accounting in __free_pages Suren Baghdasaryan
2024-03-13 14:44 ` Vlastimil Babka
2024-03-13 15:04 ` Matthew Wilcox
2024-03-13 15:31 ` Suren Baghdasaryan
2024-03-06 18:24 ` [PATCH v5 21/37] mm/page_ext: enable early_page_ext when CONFIG_MEM_ALLOC_PROFILING_DEBUG=y Suren Baghdasaryan
2024-03-06 18:24 ` [PATCH v5 22/37] lib: add codetag reference into slabobj_ext Suren Baghdasaryan
2024-03-06 18:24 ` [PATCH v5 23/37] mm/slab: add allocation accounting into slab allocation and free paths Suren Baghdasaryan
2024-03-15 10:58 ` Vlastimil Babka
2024-03-15 15:43 ` Suren Baghdasaryan
2024-03-15 16:52 ` Vlastimil Babka
2024-03-15 17:06 ` Suren Baghdasaryan
2024-03-06 18:24 ` [PATCH v5 24/37] rust: Add a rust helper for krealloc() Suren Baghdasaryan
2024-03-08 15:23 ` Miguel Ojeda
2024-03-06 18:24 ` [PATCH v5 25/37] mm/slab: enable slab allocation tagging for kmalloc and friends Suren Baghdasaryan
2024-03-06 18:24 ` [PATCH v5 26/37] mempool: Hook up to memory allocation profiling Suren Baghdasaryan
2024-03-06 18:24 ` [PATCH v5 27/37] mm: percpu: Introduce pcpuobj_ext Suren Baghdasaryan
2024-03-06 18:24 ` [PATCH v5 28/37] mm: percpu: Add codetag reference into pcpuobj_ext Suren Baghdasaryan
2024-03-06 18:24 ` [PATCH v5 29/37] mm: percpu: enable per-cpu allocation tagging Suren Baghdasaryan
2024-03-06 18:24 ` [PATCH v5 30/37] mm: vmalloc: Enable memory allocation profiling Suren Baghdasaryan
2024-03-06 18:24 ` [PATCH v5 31/37] rhashtable: Plumb through alloc tag Suren Baghdasaryan
2024-03-06 18:24 ` [PATCH v5 32/37] lib: add memory allocations report in show_mem() Suren Baghdasaryan
2024-03-06 18:24 ` [PATCH v5 33/37] codetag: debug: skip objext checking when it's for objext itself Suren Baghdasaryan
2024-03-06 18:24 ` [PATCH v5 34/37] codetag: debug: mark codetags for reserved pages as empty Suren Baghdasaryan
2024-03-06 18:24 ` [PATCH v5 35/37] codetag: debug: introduce OBJEXTS_ALLOC_FAIL to mark failed slab_ext allocations Suren Baghdasaryan
2024-03-06 18:24 ` [PATCH v5 36/37] MAINTAINERS: Add entries for code tagging and memory allocation profiling Suren Baghdasaryan
2024-03-06 18:24 ` [PATCH v5 37/37] memprofiling: Documentation Suren Baghdasaryan
2024-03-07 3:18 ` Randy Dunlap
2024-03-07 16:51 ` Suren Baghdasaryan
2024-03-07 19:58 ` Randy Dunlap
2024-03-07 18:17 ` Kent Overstreet
2024-03-07 20:03 ` Randy Dunlap
2024-03-07 20:15 ` John Hubbard
2024-03-07 20:53 ` Randy Dunlap
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