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From: Kent Overstreet To: Klara Modin Cc: Suren Baghdasaryan , akpm@linux-foundation.org, mhocko@suse.com, vbabka@suse.cz, hannes@cmpxchg.org, roman.gushchin@linux.dev, mgorman@suse.de, dave@stgolabs.net, willy@infradead.org, liam.howlett@oracle.com, penguin-kernel@i-love.sakura.ne.jp, corbet@lwn.net, void@manifault.com, "Peter Zijlstra (Intel)" , juri.lelli@redhat.com, catalin.marinas@arm.com, will@kernel.org, arnd@arndb.de, tglx@linutronix.de, mingo@redhat.com, dave.hansen@linux.intel.com, x86@kernel.org, peterx@redhat.com, david@redhat.com, axboe@kernel.dk, mcgrof@kernel.org, masahiroy@kernel.org, Nathan Chancellor , dennis@kernel.org, jhubbard@nvidia.com, tj@kernel.org, muchun.song@linux.dev, rppt@kernel.org, paulmck@kernel.org, pasha.tatashin@soleen.com, yosryahmed@google.com, yuzhao@google.com, David Howells , hughd@google.com, andreyknvl@gmail.com, keescook@chromium.org, ndesaulniers@google.com, vvvvvv@google.com, gregkh@linuxfoundation.org, ebiggers@google.com, ytcoode@gmail.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, bristot@redhat.com, vschneid@redhat.com, cl@linux.com, penberg@kernel.org, iamjoonsoo.kim@lge.com, 42.hyeyoo@gmail.com, glider@google.com, elver@google.com, dvyukov@google.com, songmuchun@bytedance.com, jbaron@akamai.com, aliceryhl@google.com, rientjes@google.com, minchan@google.com, kaleshsingh@google.com, kernel-team@android.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, iommu@lists.linux.dev, linux-arch@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-modules@vger.kernel.org, kasan-dev@googlegroups.com, cgroups@vger.kernel.org Subject: Re: [PATCH v6 13/37] lib: add allocation tagging support for memory allocation profiling Message-ID: <76nf3dl4cqptqv5oh54njnp4rizot7bej32fufjjtreizzcw3w@rkbjbgujk6pk> References: <6b8149f3-80e6-413c-abcb-1925ecda9d8c@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <6b8149f3-80e6-413c-abcb-1925ecda9d8c@gmail.com> X-Migadu-Flow: FLOW_OUT X-Rspamd-Queue-Id: 9BCC3180010 X-Rspam-User: X-Rspamd-Server: rspam04 X-Stat-Signature: 3xgw7fw5p65bpa396zth4isqn4puk6zd X-HE-Tag: 1712440090-265887 X-HE-Meta: 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 mpetkX3Q TecmRFeeBDHFD6Vs2Yd546Voq8EvU/9NcczxxtisRDDca+74hMTsKhbNTwrMBkAkpayIbJ3uPYewEDlAFGxjQ5cD6lWe/Pb0Pr6sp+eUfR/aLS8nKZffbNwiDmJxRFPBrKizZQmqZKWvKt5bxztdoVIeGLOAfFmx6Vnv5W/CBk/h1eXc9OCeIX3U3vkjAL2q3OG5hmZmEQE+6dw+4mP7c3jiS0x4HSuctdx3UHLrcxhctCPSBwZCeO5a9OMZwVkKS93X9yU+ueM+ljIo= 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 Fri, Apr 05, 2024 at 03:54:45PM +0200, Klara Modin wrote: > Hi, > > On 2024-03-21 17:36, Suren Baghdasaryan wrote: > > Introduce CONFIG_MEM_ALLOC_PROFILING which provides definitions to easily > > instrument memory allocators. It registers an "alloc_tags" codetag type > > with /proc/allocinfo interface to output allocation tag information when > > the feature is enabled. > > CONFIG_MEM_ALLOC_PROFILING_DEBUG is provided for debugging the memory > > allocation profiling instrumentation. > > Memory allocation profiling can be enabled or disabled at runtime using > > /proc/sys/vm/mem_profiling sysctl when CONFIG_MEM_ALLOC_PROFILING_DEBUG=n. > > CONFIG_MEM_ALLOC_PROFILING_ENABLED_BY_DEFAULT enables memory allocation > > profiling by default. > > > > Signed-off-by: Suren Baghdasaryan > > Co-developed-by: Kent Overstreet > > Signed-off-by: Kent Overstreet > > With this commit (9e2dcefa791e9d14006b360fba3455510fd3325d in > next-20240404), randconfig with KCONFIG_SEED=0xE6264236 fails to build > with the attached error. The following patch fixes the build error for me, > but I don't know if it's correct. Looks good - if you sound out an official patch I'll ack it. > > Kind regards, > Klara Modin > > diff --git a/include/linux/alloc_tag.h b/include/linux/alloc_tag.h > index 100ddf66eb8e..1c765d80298b 100644 > --- a/include/linux/alloc_tag.h > +++ b/include/linux/alloc_tag.h > @@ -12,6 +12,7 @@ > #include > #include > #include > +#include > > struct alloc_tag_counters { > u64 bytes; > > > diff --git a/include/linux/alloc_tag.h b/include/linux/alloc_tag.h > > new file mode 100644 > > index 000000000000..b970ff1c80dc > > --- /dev/null > > +++ b/include/linux/alloc_tag.h > > @@ -0,0 +1,145 @@ > > +/* SPDX-License-Identifier: GPL-2.0 */ > > +/* > > + * allocation tagging > > + */ > > +#ifndef _LINUX_ALLOC_TAG_H > > +#define _LINUX_ALLOC_TAG_H > > + > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > + > > +struct alloc_tag_counters { > > + u64 bytes; > > + u64 calls; > > +}; > > + > > +/* > > + * An instance of this structure is created in a special ELF section at every > > + * allocation callsite. At runtime, the special section is treated as > > + * an array of these. Embedded codetag utilizes codetag framework. > > + */ > > +struct alloc_tag { > > + struct codetag ct; > > + struct alloc_tag_counters __percpu *counters; > > +} __aligned(8); > > + > > +#ifdef CONFIG_MEM_ALLOC_PROFILING > > + > > +static inline struct alloc_tag *ct_to_alloc_tag(struct codetag *ct) > > +{ > > + return container_of(ct, struct alloc_tag, ct); > > +} > > + > > +#ifdef ARCH_NEEDS_WEAK_PER_CPU > > +/* > > + * When percpu variables are required to be defined as weak, static percpu > > + * variables can't be used inside a function (see comments for DECLARE_PER_CPU_SECTION). > > + */ > > +#error "Memory allocation profiling is incompatible with ARCH_NEEDS_WEAK_PER_CPU" > > +#endif > > + > > +#define DEFINE_ALLOC_TAG(_alloc_tag) \ > > + static DEFINE_PER_CPU(struct alloc_tag_counters, _alloc_tag_cntr); \ > > + static struct alloc_tag _alloc_tag __used __aligned(8) \ > > + __section("alloc_tags") = { \ > > + .ct = CODE_TAG_INIT, \ > > + .counters = &_alloc_tag_cntr }; > > + > > +DECLARE_STATIC_KEY_MAYBE(CONFIG_MEM_ALLOC_PROFILING_ENABLED_BY_DEFAULT, > > + mem_alloc_profiling_key); > > + > > +static inline bool mem_alloc_profiling_enabled(void) > > +{ > > + return static_branch_maybe(CONFIG_MEM_ALLOC_PROFILING_ENABLED_BY_DEFAULT, > > + &mem_alloc_profiling_key); > > +} > > + > > +static inline struct alloc_tag_counters alloc_tag_read(struct alloc_tag *tag) > > +{ > > + struct alloc_tag_counters v = { 0, 0 }; > > + struct alloc_tag_counters *counter; > > + int cpu; > > + > > + for_each_possible_cpu(cpu) { > > + counter = per_cpu_ptr(tag->counters, cpu); > > + v.bytes += counter->bytes; > > + v.calls += counter->calls; > > + } > > + > > + return v; > > +} > > + > > +#ifdef CONFIG_MEM_ALLOC_PROFILING_DEBUG > > +static inline void alloc_tag_add_check(union codetag_ref *ref, struct alloc_tag *tag) > > +{ > > + WARN_ONCE(ref && ref->ct, > > + "alloc_tag was not cleared (got tag for %s:%u)\n", > > + ref->ct->filename, ref->ct->lineno); > > + > > + WARN_ONCE(!tag, "current->alloc_tag not set"); > > +} > > + > > +static inline void alloc_tag_sub_check(union codetag_ref *ref) > > +{ > > + WARN_ONCE(ref && !ref->ct, "alloc_tag was not set\n"); > > +} > > +#else > > +static inline void alloc_tag_add_check(union codetag_ref *ref, struct alloc_tag *tag) {} > > +static inline void alloc_tag_sub_check(union codetag_ref *ref) {} > > +#endif > > + > > +/* Caller should verify both ref and tag to be valid */ > > +static inline void __alloc_tag_ref_set(union codetag_ref *ref, struct alloc_tag *tag) > > +{ > > + ref->ct = &tag->ct; > > + /* > > + * We need in increment the call counter every time we have a new > > + * allocation or when we split a large allocation into smaller ones. > > + * Each new reference for every sub-allocation needs to increment call > > + * counter because when we free each part the counter will be decremented. > > + */ > > + this_cpu_inc(tag->counters->calls); > > +} > > + > > +static inline void alloc_tag_add(union codetag_ref *ref, struct alloc_tag *tag, size_t bytes) > > +{ > > + alloc_tag_add_check(ref, tag); > > + if (!ref || !tag) > > + return; > > + > > + __alloc_tag_ref_set(ref, tag); > > + this_cpu_add(tag->counters->bytes, bytes); > > +} > > + > > +static inline void alloc_tag_sub(union codetag_ref *ref, size_t bytes) > > +{ > > + struct alloc_tag *tag; > > + > > + alloc_tag_sub_check(ref); > > + if (!ref || !ref->ct) > > + return; > > + > > + tag = ct_to_alloc_tag(ref->ct); > > + > > + this_cpu_sub(tag->counters->bytes, bytes); > > + this_cpu_dec(tag->counters->calls); > > + > > + ref->ct = NULL; > > +} > > + > > +#else /* CONFIG_MEM_ALLOC_PROFILING */ > > + > > +#define DEFINE_ALLOC_TAG(_alloc_tag) > > +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) {} > > + > > +#endif /* CONFIG_MEM_ALLOC_PROFILING */ > > + > > +#endif /* _LINUX_ALLOC_TAG_H */ > In file included from ./arch/x86/include/asm/percpu.h:615, > from ./arch/x86/include/asm/preempt.h:6, > from ./include/linux/preempt.h:79, > from ./include/linux/alloc_tag.h:11, > from lib/alloc_tag.c:2: > ./include/linux/alloc_tag.h: In function ‘__alloc_tag_ref_set’: > ./include/asm-generic/percpu.h:155:9: error: implicit declaration of function ‘raw_local_irq_save’ [-Werror=implicit-function-declaration] > 155 | raw_local_irq_save(__flags); \ > | ^~~~~~~~~~~~~~~~~~ > ./include/asm-generic/percpu.h:410:41: note: in expansion of macro ‘this_cpu_generic_to_op’ > 410 | #define this_cpu_add_8(pcp, val) this_cpu_generic_to_op(pcp, val, +=) > | ^~~~~~~~~~~~~~~~~~~~~~ > ./include/linux/percpu-defs.h:368:25: note: in expansion of macro ‘this_cpu_add_8’ > 368 | case 8: stem##8(variable, __VA_ARGS__);break; \ > | ^~~~ > ./include/linux/percpu-defs.h:491:41: note: in expansion of macro ‘__pcpu_size_call’ > 491 | #define this_cpu_add(pcp, val) __pcpu_size_call(this_cpu_add_, pcp, val) > | ^~~~~~~~~~~~~~~~ > ./include/linux/percpu-defs.h:501:41: note: in expansion of macro ‘this_cpu_add’ > 501 | #define this_cpu_inc(pcp) this_cpu_add(pcp, 1) > | ^~~~~~~~~~~~ > ./include/linux/alloc_tag.h:106:9: note: in expansion of macro ‘this_cpu_inc’ > 106 | this_cpu_inc(tag->counters->calls); > | ^~~~~~~~~~~~ > ./include/asm-generic/percpu.h:157:9: error: implicit declaration of function ‘raw_local_irq_restore’ [-Werror=implicit-function-declaration] > 157 | raw_local_irq_restore(__flags); \ > | ^~~~~~~~~~~~~~~~~~~~~ > ./include/asm-generic/percpu.h:410:41: note: in expansion of macro ‘this_cpu_generic_to_op’ > 410 | #define this_cpu_add_8(pcp, val) this_cpu_generic_to_op(pcp, val, +=) > | ^~~~~~~~~~~~~~~~~~~~~~ > ./include/linux/percpu-defs.h:368:25: note: in expansion of macro ‘this_cpu_add_8’ > 368 | case 8: stem##8(variable, __VA_ARGS__);break; \ > | ^~~~ > ./include/linux/percpu-defs.h:491:41: note: in expansion of macro ‘__pcpu_size_call’ > 491 | #define this_cpu_add(pcp, val) __pcpu_size_call(this_cpu_add_, pcp, val) > | ^~~~~~~~~~~~~~~~ > ./include/linux/percpu-defs.h:501:41: note: in expansion of macro ‘this_cpu_add’ > 501 | #define this_cpu_inc(pcp) this_cpu_add(pcp, 1) > | ^~~~~~~~~~~~ > ./include/linux/alloc_tag.h:106:9: note: in expansion of macro ‘this_cpu_inc’ > 106 | this_cpu_inc(tag->counters->calls); > | ^~~~~~~~~~~~ > cc1: some warnings being treated as errors > make[3]: *** [scripts/Makefile.build:244: lib/alloc_tag.o] Error 1 > make[2]: *** [scripts/Makefile.build:485: lib] Error 2 > make[1]: *** [/home/klara/git/linux/Makefile:1919: .] Error 2 > make: *** [Makefile:240: __sub-make] Error 2 > # bad: [2b3d5988ae2cb5cd945ddbc653f0a71706231fdd] Add linux-next specific files for 20240404 > git bisect start 'next/master' > # status: waiting for good commit(s), bad commit known > # good: [39cd87c4eb2b893354f3b850f916353f2658ae6f] Linux 6.9-rc2 > git bisect good 39cd87c4eb2b893354f3b850f916353f2658ae6f > # bad: [cc7b62666779616ff52d389a344ffe2c041e36e2] Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth-next.git > git bisect bad cc7b62666779616ff52d389a344ffe2c041e36e2 > # bad: [d6b7dd0f8d84f9fdf2af65fceb608e3206276e81] Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/qcom/linux.git > git bisect bad d6b7dd0f8d84f9fdf2af65fceb608e3206276e81 > # bad: [ad6a31687713a8f12165e730e0eb6e0de3beae56] Merge branch 'mm-everything' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm > git bisect bad ad6a31687713a8f12165e730e0eb6e0de3beae56 > # good: [59266d9886adb5c9e240129ccc606727fd3a881d] Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux.git > git bisect good 59266d9886adb5c9e240129ccc606727fd3a881d > # bad: [085e5fe7388cf36ab5c02d91022229e5fade5b30] mm: merge folio_is_secretmem() and folio_fast_pin_allowed() into gup_fast_folio_allowed() > git bisect bad 085e5fe7388cf36ab5c02d91022229e5fade5b30 > # bad: [f6a61baa9139d174170acdae8667b3246ce44db6] lib: add memory allocations report in show_mem() > git bisect bad f6a61baa9139d174170acdae8667b3246ce44db6 > # good: [302519d9e80a7fbf2cf8d0b8961d491af648759f] asm-generic/io.h: kill vmalloc.h dependency > git bisect good 302519d9e80a7fbf2cf8d0b8961d491af648759f > # bad: [e6942003e682e3883847459c3d07e23c796a2782] mm: create new codetag references during page splitting > git bisect bad e6942003e682e3883847459c3d07e23c796a2782 > # good: [ed97151dec736c1541bfac2b801108d54ebee5bc] lib: code tagging module support > git bisect good ed97151dec736c1541bfac2b801108d54ebee5bc > # bad: [95767bde5020afefef4205b60e71f4ebf96da74e] lib: introduce early boot parameter to avoid page_ext memory overhead > git bisect bad 95767bde5020afefef4205b60e71f4ebf96da74e > # bad: [9e2dcefa791e9d14006b360fba3455510fd3325d] lib: add allocation tagging support for memory allocation profiling > git bisect bad 9e2dcefa791e9d14006b360fba3455510fd3325d > # good: [0eccd42fbf9d7c4ae0cbec48cce637da89813c2c] lib: prevent module unloading if memory is not freed > git bisect good 0eccd42fbf9d7c4ae0cbec48cce637da89813c2c > # first bad commit: [9e2dcefa791e9d14006b360fba3455510fd3325d] lib: add allocation tagging support for memory allocation profiling