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Tue, 24 Oct 2023 06:47:17 -0700 (PDT) Date: Tue, 24 Oct 2023 06:46:13 -0700 In-Reply-To: <20231024134637.3120277-1-surenb@google.com> Mime-Version: 1.0 References: <20231024134637.3120277-1-surenb@google.com> X-Mailer: git-send-email 2.42.0.758.gaed0368e0e-goog Message-ID: <20231024134637.3120277-17-surenb@google.com> Subject: [PATCH v2 16/39] lib: introduce support for page allocation tagging From: Suren Baghdasaryan To: akpm@linux-foundation.org Cc: kent.overstreet@linux.dev, 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, corbet@lwn.net, void@manifault.com, peterz@infradead.org, juri.lelli@redhat.com, ldufour@linux.ibm.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@kernel.org, dennis@kernel.org, tj@kernel.org, muchun.song@linux.dev, rppt@kernel.org, paulmck@kernel.org, pasha.tatashin@soleen.com, yosryahmed@google.com, yuzhao@google.com, dhowells@redhat.com, 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, shakeelb@google.com, songmuchun@bytedance.com, jbaron@akamai.com, rientjes@google.com, minchan@google.com, kaleshsingh@google.com, surenb@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 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Introduce helper functions to easily instrument page allocators by storing a pointer to the allocation tag associated with the code that allocated the page in a page_ext field. Signed-off-by: Suren Baghdasaryan Co-developed-by: Kent Overstreet Signed-off-by: Kent Overstreet --- include/linux/page_ext.h | 1 - include/linux/pgalloc_tag.h | 73 +++++++++++++++++++++++++++++++++++++ lib/Kconfig.debug | 1 + lib/alloc_tag.c | 17 +++++++++ mm/mm_init.c | 1 + mm/page_alloc.c | 4 ++ mm/page_ext.c | 4 ++ 7 files changed, 100 insertions(+), 1 deletion(-) create mode 100644 include/linux/pgalloc_tag.h diff --git a/include/linux/page_ext.h b/include/linux/page_ext.h index be98564191e6..07e0656898f9 100644 --- a/include/linux/page_ext.h +++ b/include/linux/page_ext.h @@ -4,7 +4,6 @@ =20 #include #include -#include =20 struct pglist_data; =20 diff --git a/include/linux/pgalloc_tag.h b/include/linux/pgalloc_tag.h new file mode 100644 index 000000000000..a060c26eb449 --- /dev/null +++ b/include/linux/pgalloc_tag.h @@ -0,0 +1,73 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * page allocation tagging + */ +#ifndef _LINUX_PGALLOC_TAG_H +#define _LINUX_PGALLOC_TAG_H + +#include + +#ifdef CONFIG_MEM_ALLOC_PROFILING + +#include + +extern struct page_ext_operations page_alloc_tagging_ops; +extern struct page_ext *page_ext_get(struct page *page); +extern void page_ext_put(struct page_ext *page_ext); + +static inline union codetag_ref *codetag_ref_from_page_ext(struct page_ext= *page_ext) +{ + return (void *)page_ext + page_alloc_tagging_ops.offset; +} + +static inline struct page_ext *page_ext_from_codetag_ref(union codetag_ref= *ref) +{ + return (void *)ref - page_alloc_tagging_ops.offset; +} + +static inline union codetag_ref *get_page_tag_ref(struct page *page) +{ + if (page && mem_alloc_profiling_enabled()) { + struct page_ext *page_ext =3D page_ext_get(page); + + if (page_ext) + return codetag_ref_from_page_ext(page_ext); + } + return NULL; +} + +static inline void put_page_tag_ref(union codetag_ref *ref) +{ + page_ext_put(page_ext_from_codetag_ref(ref)); +} + +static inline void pgalloc_tag_add(struct page *page, struct task_struct *= task, + unsigned int order) +{ + union codetag_ref *ref =3D get_page_tag_ref(page); + + if (ref) { + alloc_tag_add(ref, task->alloc_tag, PAGE_SIZE << order); + put_page_tag_ref(ref); + } +} + +static inline void pgalloc_tag_sub(struct page *page, unsigned int order) +{ + union codetag_ref *ref =3D get_page_tag_ref(page); + + if (ref) { + alloc_tag_sub(ref, PAGE_SIZE << order); + put_page_tag_ref(ref); + } +} + +#else /* CONFIG_MEM_ALLOC_PROFILING */ + +static inline void pgalloc_tag_add(struct page *page, struct task_struct *= task, + unsigned int order) {} +static inline void pgalloc_tag_sub(struct page *page, unsigned int order) = {} + +#endif /* CONFIG_MEM_ALLOC_PROFILING */ + +#endif /* _LINUX_PGALLOC_TAG_H */ diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 475a14e70566..e1eda1450d68 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -972,6 +972,7 @@ config MEM_ALLOC_PROFILING depends on PROC_FS depends on !DEBUG_FORCE_WEAK_PER_CPU select CODE_TAGGING + select PAGE_EXTENSION help Track allocation source code and record total allocation size initiated at that code location. The mechanism can be used to track diff --git a/lib/alloc_tag.c b/lib/alloc_tag.c index 4fc031f9cefd..2d5226d9262d 100644 --- a/lib/alloc_tag.c +++ b/lib/alloc_tag.c @@ -3,6 +3,7 @@ #include #include #include +#include #include #include #include @@ -124,6 +125,22 @@ static bool alloc_tag_module_unload(struct codetag_typ= e *cttype, return module_unused; } =20 +static __init bool need_page_alloc_tagging(void) +{ + return true; +} + +static __init void init_page_alloc_tagging(void) +{ +} + +struct page_ext_operations page_alloc_tagging_ops =3D { + .size =3D sizeof(union codetag_ref), + .need =3D need_page_alloc_tagging, + .init =3D init_page_alloc_tagging, +}; +EXPORT_SYMBOL(page_alloc_tagging_ops); + static struct ctl_table memory_allocation_profiling_sysctls[] =3D { { .procname =3D "mem_profiling", diff --git a/mm/mm_init.c b/mm/mm_init.c index 50f2f34745af..8e72e431dc35 100644 --- a/mm/mm_init.c +++ b/mm/mm_init.c @@ -24,6 +24,7 @@ #include #include #include +#include #include #include #include "internal.h" diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 95546f376302..d490d0f73e72 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -52,6 +52,7 @@ #include #include #include +#include #include #include "internal.h" #include "shuffle.h" @@ -1093,6 +1094,7 @@ static __always_inline bool free_pages_prepare(struct= page *page, __memcg_kmem_uncharge_page(page, order); reset_page_owner(page, order); page_table_check_free(page, order); + pgalloc_tag_sub(page, order); return false; } =20 @@ -1135,6 +1137,7 @@ static __always_inline bool free_pages_prepare(struct= page *page, page->flags &=3D ~PAGE_FLAGS_CHECK_AT_PREP; reset_page_owner(page, order); page_table_check_free(page, order); + pgalloc_tag_sub(page, order); =20 if (!PageHighMem(page)) { debug_check_no_locks_freed(page_address(page), @@ -1535,6 +1538,7 @@ inline void post_alloc_hook(struct page *page, unsign= ed int order, =20 set_page_owner(page, order, gfp_flags); page_table_check_alloc(page, order); + pgalloc_tag_add(page, current, order); } =20 static void prep_new_page(struct page *page, unsigned int order, gfp_t gfp= _flags, diff --git a/mm/page_ext.c b/mm/page_ext.c index 4548fcc66d74..3c58fe8a24df 100644 --- a/mm/page_ext.c +++ b/mm/page_ext.c @@ -10,6 +10,7 @@ #include #include #include +#include =20 /* * struct page extension @@ -82,6 +83,9 @@ static struct page_ext_operations *page_ext_ops[] __initd= ata =3D { #if defined(CONFIG_PAGE_IDLE_FLAG) && !defined(CONFIG_64BIT) &page_idle_ops, #endif +#ifdef CONFIG_MEM_ALLOC_PROFILING + &page_alloc_tagging_ops, +#endif #ifdef CONFIG_PAGE_TABLE_CHECK &page_table_check_ops, #endif --=20 2.42.0.758.gaed0368e0e-goog