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Wed, 10 Sep 2025 06:25:53 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id ovcxB/EZwWiYBwAAD6G6ig (envelope-from ); Wed, 10 Sep 2025 06:25:53 +0000 Message-ID: Date: Wed, 10 Sep 2025 08:25:52 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/1] alloc_tag: mark inaccurate allocation counters in /proc/allocinfo output To: Suren Baghdasaryan , akpm@linux-foundation.org Cc: kent.overstreet@linux.dev, hannes@cmpxchg.org, usamaarif642@gmail.com, rientjes@google.com, roman.gushchin@linux.dev, harry.yoo@oracle.com, shakeel.butt@linux.dev, 00107082@163.com, pasha.tatashin@soleen.com, souravpanda@google.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20250909234942.1104356-1-surenb@google.com> Content-Language: en-US From: Vlastimil Babka Autocrypt: addr=vbabka@suse.cz; keydata= xsFNBFZdmxYBEADsw/SiUSjB0dM+vSh95UkgcHjzEVBlby/Fg+g42O7LAEkCYXi/vvq31JTB KxRWDHX0R2tgpFDXHnzZcQywawu8eSq0LxzxFNYMvtB7sV1pxYwej2qx9B75qW2plBs+7+YB 87tMFA+u+L4Z5xAzIimfLD5EKC56kJ1CsXlM8S/LHcmdD9Ctkn3trYDNnat0eoAcfPIP2OZ+ 9oe9IF/R28zmh0ifLXyJQQz5ofdj4bPf8ecEW0rhcqHfTD8k4yK0xxt3xW+6Exqp9n9bydiy tcSAw/TahjW6yrA+6JhSBv1v2tIm+itQc073zjSX8OFL51qQVzRFr7H2UQG33lw2QrvHRXqD Ot7ViKam7v0Ho9wEWiQOOZlHItOOXFphWb2yq3nzrKe45oWoSgkxKb97MVsQ+q2SYjJRBBH4 8qKhphADYxkIP6yut/eaj9ImvRUZZRi0DTc8xfnvHGTjKbJzC2xpFcY0DQbZzuwsIZ8OPJCc LM4S7mT25NE5kUTG/TKQCk922vRdGVMoLA7dIQrgXnRXtyT61sg8PG4wcfOnuWf8577aXP1x 6mzw3/jh3F+oSBHb/GcLC7mvWreJifUL2gEdssGfXhGWBo6zLS3qhgtwjay0Jl+kza1lo+Cv BB2T79D4WGdDuVa4eOrQ02TxqGN7G0Biz5ZLRSFzQSQwLn8fbwARAQABzSBWbGFzdGltaWwg QmFia2EgPHZiYWJrYUBzdXNlLmN6PsLBlAQTAQoAPgIbAwULCQgHAwUVCgkICwUWAgMBAAIe AQIXgBYhBKlA1DSZLC6OmRA9UCJPp+fMgqZkBQJnyBr8BQka0IFQAAoJECJPp+fMgqZkqmMQ AIbGN95ptUMUvo6aAdhxaOCHXp1DfIBuIOK/zpx8ylY4pOwu3GRe4dQ8u4XS9gaZ96Gj4bC+ jwWcSmn+TjtKW3rH1dRKopvC07tSJIGGVyw7ieV/5cbFffA8NL0ILowzVg8w1ipnz1VTkWDr 2zcfslxJsJ6vhXw5/npcY0ldeC1E8f6UUoa4eyoskd70vO0wOAoGd02ZkJoox3F5ODM0kjHu Y97VLOa3GG66lh+ZEelVZEujHfKceCw9G3PMvEzyLFbXvSOigZQMdKzQ8D/OChwqig8wFBmV QCPS4yDdmZP3oeDHRjJ9jvMUKoYODiNKsl2F+xXwyRM2qoKRqFlhCn4usVd1+wmv9iLV8nPs 2Db1ZIa49fJet3Sk3PN4bV1rAPuWvtbuTBN39Q/6MgkLTYHb84HyFKw14Rqe5YorrBLbF3rl M51Dpf6Egu1yTJDHCTEwePWug4XI11FT8lK0LNnHNpbhTCYRjX73iWOnFraJNcURld1jL1nV r/LRD+/e2gNtSTPK0Qkon6HcOBZnxRoqtazTU6YQRmGlT0v+rukj/cn5sToYibWLn+RoV1CE Qj6tApOiHBkpEsCzHGu+iDQ1WT0Idtdynst738f/uCeCMkdRu4WMZjteQaqvARFwCy3P/jpK uvzMtves5HvZw33ZwOtMCgbpce00DaET4y/UzsBNBFsZNTUBCACfQfpSsWJZyi+SHoRdVyX5 J6rI7okc4+b571a7RXD5UhS9dlVRVVAtrU9ANSLqPTQKGVxHrqD39XSw8hxK61pw8p90pg4G /N3iuWEvyt+t0SxDDkClnGsDyRhlUyEWYFEoBrrCizbmahOUwqkJbNMfzj5Y7n7OIJOxNRkB IBOjPdF26dMP69BwePQao1M8Acrrex9sAHYjQGyVmReRjVEtv9iG4DoTsnIR3amKVk6si4Ea X/mrapJqSCcBUVYUFH8M7bsm4CSxier5ofy8jTEa/CfvkqpKThTMCQPNZKY7hke5qEq1CBk2 wxhX48ZrJEFf1v3NuV3OimgsF2odzieNABEBAAHCwXwEGAEKACYCGwwWIQSpQNQ0mSwujpkQ PVAiT6fnzIKmZAUCZ8gcVAUJFhTonwAKCRAiT6fnzIKmZLY8D/9uo3Ut9yi2YCuASWxr7QQZ lJCViArjymbxYB5NdOeC50/0gnhK4pgdHlE2MdwF6o34x7TPFGpjNFvycZqccSQPJ/gibwNA zx3q9vJT4Vw+YbiyS53iSBLXMweeVV1Jd9IjAoL+EqB0cbxoFXvnjkvP1foiiF5r73jCd4PR rD+GoX5BZ7AZmFYmuJYBm28STM2NA6LhT0X+2su16f/HtummENKcMwom0hNu3MBNPUOrujtW khQrWcJNAAsy4yMoJ2Lw51T/5X5Hc7jQ9da9fyqu+phqlVtn70qpPvgWy4HRhr25fCAEXZDp xG4RNmTm+pqorHOqhBkI7wA7P/nyPo7ZEc3L+ZkQ37u0nlOyrjbNUniPGxPxv1imVq8IyycG AN5FaFxtiELK22gvudghLJaDiRBhn8/AhXc642/Z/yIpizE2xG4KU4AXzb6C+o7LX/WmmsWP Ly6jamSg6tvrdo4/e87lUedEqCtrp2o1xpn5zongf6cQkaLZKQcBQnPmgHO5OG8+50u88D9I rywqgzTUhHFKKF6/9L/lYtrNcHU8Z6Y4Ju/MLUiNYkmtrGIMnkjKCiRqlRrZE/v5YFHbayRD dJKXobXTtCBYpLJM4ZYRpGZXne/FAtWNe4KbNJJqxMvrTOrnIatPj8NhBVI0RSJRsbilh6TE m6M14QORSWTLRg== In-Reply-To: <20250909234942.1104356-1-surenb@google.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 25CCF2000E X-Stat-Signature: hgw8bwne4u86gcw97w84k58scwf9raob X-Rspam-User: X-Rspamd-Server: rspam01 X-HE-Tag: 1757485554-864267 X-HE-Meta: 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 hFQQ+5iM uZSGyo3XVmIfJWOOW0qZ2EEcKA9sSnKArgVDfqfwVUtTeJbRswJceA62/9uAwfmxgYNID5LqklmyDwQ0mLJ9kU4BtvwqwrqUWScasHfQOC+bLDxkVBQL+FmcO+fHxtnAM73UJ/UYJYqs8H4LlB5xOkfZquRfPfMqEAny3ozHWh88Bxr+O1n0bw+iRaDmHeZjleQfCbswci/ZeGQ/R45i36MgcHEQBKmF5i72kkZgw4eSI4N3CWkb6E6tjgwsFBYr4TIl5oc8DLnnxZLnuVKMy7iLGOJ0Crj+bPY7Xh1XJC5/lQZzu8SgKs0T63g6EAve3TdCrURuN8yqilMby8kBfROM54bG6By+N7vuaI1RJIrQ94Bv5PPiUP/+BoMz92HxrtMtoGfIfy9L2eagLJ4+4IrK6hdgxte2hMEyd X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 9/10/25 01:49, Suren Baghdasaryan wrote: > While rare, memory allocation profiling can contain inaccurate counters > if slab object extension vector allocation fails. That allocation might > succeed later but prior to that, slab allocations that would have used > that object extension vector will not be accounted for. To indicate > incorrect counters, mark them with an asterisk in the /proc/allocinfo > output. > Bump up /proc/allocinfo version to reflect change in the file format. Since it's rare, is it worth the trouble? > Example output with invalid counters: > allocinfo - version: 2.0 > 0 0 arch/x86/kernel/kdebugfs.c:105 func:create_setup_data_nodes > 0 0 arch/x86/kernel/alternative.c:2090 func:alternatives_smp_module_add > 0* 0* arch/x86/kernel/alternative.c:127 func:__its_alloc > 0 0 arch/x86/kernel/fpu/regset.c:160 func:xstateregs_set > 0 0 arch/x86/kernel/fpu/xstate.c:1590 func:fpstate_realloc > 0 0 arch/x86/kernel/cpu/aperfmperf.c:379 func:arch_enable_hybrid_capacity_scale > 0 0 arch/x86/kernel/cpu/amd_cache_disable.c:258 func:init_amd_l3_attrs > 49152* 48* arch/x86/kernel/cpu/mce/core.c:2709 func:mce_device_create > 32768 1 arch/x86/kernel/cpu/mce/genpool.c:132 func:mce_gen_pool_create > 0 0 arch/x86/kernel/cpu/mce/amd.c:1341 func:mce_threshold_create_device > > Suggested-by: Johannes Weiner Here a link might have been helpful :) > Signed-off-by: Suren Baghdasaryan > --- > Patch is based on mm-new. > > include/linux/alloc_tag.h | 12 ++++++++++++ > include/linux/codetag.h | 5 ++++- > lib/alloc_tag.c | 7 +++++-- > mm/slub.c | 2 ++ > 4 files changed, 23 insertions(+), 3 deletions(-) > > diff --git a/include/linux/alloc_tag.h b/include/linux/alloc_tag.h > index 9ef2633e2c08..d40ac39bfbe8 100644 > --- a/include/linux/alloc_tag.h > +++ b/include/linux/alloc_tag.h > @@ -221,6 +221,16 @@ static inline void alloc_tag_sub(union codetag_ref *ref, size_t bytes) > ref->ct = NULL; > } > > +static inline void alloc_tag_set_inaccurate(struct alloc_tag *tag) > +{ > + tag->ct.flags |= CODETAG_FLAG_INACCURATE; > +} > + > +static inline bool alloc_tag_is_inaccurate(struct alloc_tag *tag) > +{ > + return !!(tag->ct.flags & CODETAG_FLAG_INACCURATE); > +} > + > #define alloc_tag_record(p) ((p) = current->alloc_tag) > > #else /* CONFIG_MEM_ALLOC_PROFILING */ > @@ -230,6 +240,8 @@ static inline bool mem_alloc_profiling_enabled(void) { return false; } > static inline void alloc_tag_add(union codetag_ref *ref, struct alloc_tag *tag, > size_t bytes) {} > static inline void alloc_tag_sub(union codetag_ref *ref, size_t bytes) {} > +static inline void alloc_tag_set_inaccurate(struct alloc_tag *tag) {} > +static inline bool alloc_tag_is_inaccurate(struct alloc_tag *tag) { return false; } > #define alloc_tag_record(p) do {} while (0) > > #endif /* CONFIG_MEM_ALLOC_PROFILING */ > diff --git a/include/linux/codetag.h b/include/linux/codetag.h > index 457ed8fd3214..8ea2a5f7c98a 100644 > --- a/include/linux/codetag.h > +++ b/include/linux/codetag.h > @@ -16,13 +16,16 @@ struct module; > #define CODETAG_SECTION_START_PREFIX "__start_" > #define CODETAG_SECTION_STOP_PREFIX "__stop_" > > +/* codetag flags */ > +#define CODETAG_FLAG_INACCURATE (1 << 0) > + > /* > * An instance of this structure is created in a special ELF section at every > * code location being tagged. At runtime, the special section is treated as > * an array of these. > */ > struct codetag { > - unsigned int flags; /* used in later patches */ > + unsigned int flags; > unsigned int lineno; > const char *modname; > const char *function; > diff --git a/lib/alloc_tag.c b/lib/alloc_tag.c > index e9b33848700a..a7f15117c759 100644 > --- a/lib/alloc_tag.c > +++ b/lib/alloc_tag.c > @@ -80,7 +80,7 @@ static void allocinfo_stop(struct seq_file *m, void *arg) > static void print_allocinfo_header(struct seq_buf *buf) > { > /* Output format version, so we can change it. */ > - seq_buf_printf(buf, "allocinfo - version: 1.0\n"); > + seq_buf_printf(buf, "allocinfo - version: 2.0\n"); > seq_buf_printf(buf, "# \n"); > } > > @@ -90,7 +90,10 @@ static void alloc_tag_to_text(struct seq_buf *out, struct codetag *ct) > struct alloc_tag_counters counter = alloc_tag_read(tag); > s64 bytes = counter.bytes; > > - seq_buf_printf(out, "%12lli %8llu ", bytes, counter.calls); > + if (unlikely(alloc_tag_is_inaccurate(tag))) > + seq_buf_printf(out, "%11lli* %7llu* ", bytes, counter.calls); > + else > + seq_buf_printf(out, "%12lli %8llu ", bytes, counter.calls); > codetag_to_text(out, ct); > seq_buf_putc(out, ' '); > seq_buf_putc(out, '\n'); > diff --git a/mm/slub.c b/mm/slub.c > index af343ca570b5..9c04f29ee8de 100644 > --- a/mm/slub.c > +++ b/mm/slub.c > @@ -2143,6 +2143,8 @@ __alloc_tagging_slab_alloc_hook(struct kmem_cache *s, void *object, gfp_t flags) > */ > if (likely(obj_exts)) > alloc_tag_add(&obj_exts->ref, current->alloc_tag, s->size); > + else > + alloc_tag_set_inaccurate(current->alloc_tag); > } > > static inline void > > base-commit: f4e8f46973fe0c0f579944a37e96ba9efbe00cca