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AJvYcCVTpxs+eg3ligXuTzcFHSduuwf5Sleq7oxb9ZMVwbTgHVmVVTRSr42i0RO8qT5HhsjvEYvb8ZXkPVkJ0eI0@vger.kernel.org X-Gm-Message-State: AOJu0Yxkv5DFEmNHHMZ4ABgrchgHUVNQLSt2IZe998+jy59EyY9grP5w dXuGDbDxoF9RS4qgyu/G6F/Y37TwLJUSvyTB6ajdhYPDcaKpbbp4pAi3kl8dxtPQIHNpoqSWpky TXA== X-Google-Smtp-Source: AGHT+IHWTSefrY2mOEgvtjZrHcKSjJbm4CbIxnZltjP19nac0+xcMzP1s41Uk58cU65/uvtLl+YlVZeSEX4= X-Received: from surenb-desktop.mtv.corp.google.com ([2a00:79e0:2e3f:8:a087:59b9:198a:c44c]) (user=surenb job=sendgmr) by 2002:a5b:70b:0:b0:e28:e4a7:3206 with SMTP id 3f1490d57ef6-e2e3a6d62a7mr4485276.8.1729703291999; Wed, 23 Oct 2024 10:08:11 -0700 (PDT) Date: Wed, 23 Oct 2024 10:07:58 -0700 In-Reply-To: <20241023170759.999909-1-surenb@google.com> Precedence: bulk X-Mailing-List: linux-modules@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20241023170759.999909-1-surenb@google.com> X-Mailer: git-send-email 2.47.0.105.g07ac214952-goog Message-ID: <20241023170759.999909-6-surenb@google.com> Subject: [PATCH v4 5/6] alloc_tag: introduce pgtag_ref_handle to abstract page tag references From: Suren Baghdasaryan To: akpm@linux-foundation.org Cc: kent.overstreet@linux.dev, corbet@lwn.net, arnd@arndb.de, mcgrof@kernel.org, rppt@kernel.org, paulmck@kernel.org, thuth@redhat.com, tglx@linutronix.de, bp@alien8.de, xiongwei.song@windriver.com, ardb@kernel.org, david@redhat.com, vbabka@suse.cz, mhocko@suse.com, hannes@cmpxchg.org, roman.gushchin@linux.dev, dave@stgolabs.net, willy@infradead.org, liam.howlett@oracle.com, pasha.tatashin@soleen.com, souravpanda@google.com, keescook@chromium.org, dennis@kernel.org, jhubbard@nvidia.com, urezki@gmail.com, hch@infradead.org, petr.pavlu@suse.com, samitolvanen@google.com, da.gomez@samsung.com, yuzhao@google.com, vvvvvv@google.com, rostedt@goodmis.org, iamjoonsoo.kim@lge.com, rientjes@google.com, minchan@google.com, kaleshsingh@google.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, maple-tree@lists.infradead.org, linux-modules@vger.kernel.org, kernel-team@android.com, surenb@google.com To simplify later changes to page tag references, introduce new pgtag_ref_handle type. This allows easy replacement of page_ext as a storage of page allocation tags. Signed-off-by: Suren Baghdasaryan Reviewed-by: Pasha Tatashin --- include/linux/mm.h | 25 +++++----- include/linux/pgalloc_tag.h | 92 ++++++++++++++++++++++--------------- 2 files changed, 67 insertions(+), 50 deletions(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index 5cd22303fbc0..8efb4a6a1a70 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -4180,37 +4180,38 @@ static inline void pgalloc_tag_split(struct folio *folio, int old_order, int new return; for (i = nr_pages; i < (1 << old_order); i += nr_pages) { - union codetag_ref *ref = get_page_tag_ref(folio_page(folio, i)); + union pgtag_ref_handle handle; + union codetag_ref ref; - if (ref) { + if (get_page_tag_ref(folio_page(folio, i), &ref, &handle)) { /* Set new reference to point to the original tag */ - alloc_tag_ref_set(ref, tag); - put_page_tag_ref(ref); + alloc_tag_ref_set(&ref, tag); + update_page_tag_ref(handle, &ref); + put_page_tag_ref(handle); } } } static inline void pgalloc_tag_copy(struct folio *new, struct folio *old) { + union pgtag_ref_handle handle; + union codetag_ref ref; struct alloc_tag *tag; - union codetag_ref *ref; tag = pgalloc_tag_get(&old->page); if (!tag) return; - ref = get_page_tag_ref(&new->page); - if (!ref) + if (!get_page_tag_ref(&new->page, &ref, &handle)) return; /* Clear the old ref to the original allocation tag. */ clear_page_tag_ref(&old->page); /* Decrement the counters of the tag on get_new_folio. */ - alloc_tag_sub(ref, folio_nr_pages(new)); - - __alloc_tag_ref_set(ref, tag); - - put_page_tag_ref(ref); + alloc_tag_sub(&ref, folio_nr_pages(new)); + __alloc_tag_ref_set(&ref, tag); + update_page_tag_ref(handle, &ref); + put_page_tag_ref(handle); } #else /* !CONFIG_MEM_ALLOC_PROFILING */ static inline void pgalloc_tag_split(struct folio *folio, int old_order, int new_order) diff --git a/include/linux/pgalloc_tag.h b/include/linux/pgalloc_tag.h index 59a3deb792a8..b13cd3313a88 100644 --- a/include/linux/pgalloc_tag.h +++ b/include/linux/pgalloc_tag.h @@ -11,46 +11,59 @@ #include +union pgtag_ref_handle { + union codetag_ref *ref; /* reference in page extension */ +}; + extern struct page_ext_operations page_alloc_tagging_ops; -static inline union codetag_ref *codetag_ref_from_page_ext(struct page_ext *page_ext) +/* Should be called only if mem_alloc_profiling_enabled() */ +static inline bool get_page_tag_ref(struct page *page, union codetag_ref *ref, + union pgtag_ref_handle *handle) { - return (union codetag_ref *)page_ext_data(page_ext, &page_alloc_tagging_ops); -} + struct page_ext *page_ext; + union codetag_ref *tmp; -static inline struct page_ext *page_ext_from_codetag_ref(union codetag_ref *ref) -{ - return (void *)ref - page_alloc_tagging_ops.offset; + if (!page) + return false; + + page_ext = page_ext_get(page); + if (!page_ext) + return false; + + tmp = (union codetag_ref *)page_ext_data(page_ext, &page_alloc_tagging_ops); + ref->ct = tmp->ct; + handle->ref = tmp; + return true; } -/* Should be called only if mem_alloc_profiling_enabled() */ -static inline union codetag_ref *get_page_tag_ref(struct page *page) +static inline void put_page_tag_ref(union pgtag_ref_handle handle) { - if (page) { - struct page_ext *page_ext = page_ext_get(page); + if (WARN_ON(!handle.ref)) + return; - if (page_ext) - return codetag_ref_from_page_ext(page_ext); - } - return NULL; + page_ext_put((void *)handle.ref - page_alloc_tagging_ops.offset); } -static inline void put_page_tag_ref(union codetag_ref *ref) +static inline void update_page_tag_ref(union pgtag_ref_handle handle, + union codetag_ref *ref) { - if (WARN_ON(!ref)) + if (WARN_ON(!handle.ref || !ref)) return; - page_ext_put(page_ext_from_codetag_ref(ref)); + handle.ref->ct = ref->ct; } static inline void clear_page_tag_ref(struct page *page) { if (mem_alloc_profiling_enabled()) { - union codetag_ref *ref = get_page_tag_ref(page); + union pgtag_ref_handle handle; + union codetag_ref ref; - if (ref) { - set_codetag_empty(ref); - put_page_tag_ref(ref); + if (get_page_tag_ref(page, &ref, &handle)) { + set_codetag_empty(&ref); + update_page_tag_ref(handle, &ref); + put_page_tag_ref(handle); } } } @@ -59,11 +72,13 @@ static inline void pgalloc_tag_add(struct page *page, struct task_struct *task, unsigned int nr) { if (mem_alloc_profiling_enabled()) { - union codetag_ref *ref = get_page_tag_ref(page); + union pgtag_ref_handle handle; + union codetag_ref ref; - if (ref) { - alloc_tag_add(ref, task->alloc_tag, PAGE_SIZE * nr); - put_page_tag_ref(ref); + if (get_page_tag_ref(page, &ref, &handle)) { + alloc_tag_add(&ref, task->alloc_tag, PAGE_SIZE * nr); + update_page_tag_ref(handle, &ref); + put_page_tag_ref(handle); } } } @@ -71,11 +86,13 @@ static inline void pgalloc_tag_add(struct page *page, struct task_struct *task, static inline void pgalloc_tag_sub(struct page *page, unsigned int nr) { if (mem_alloc_profiling_enabled()) { - union codetag_ref *ref = get_page_tag_ref(page); + union pgtag_ref_handle handle; + union codetag_ref ref; - if (ref) { - alloc_tag_sub(ref, PAGE_SIZE * nr); - put_page_tag_ref(ref); + if (get_page_tag_ref(page, &ref, &handle)) { + alloc_tag_sub(&ref, PAGE_SIZE * nr); + update_page_tag_ref(handle, &ref); + put_page_tag_ref(handle); } } } @@ -85,13 +102,14 @@ static inline struct alloc_tag *pgalloc_tag_get(struct page *page) struct alloc_tag *tag = NULL; if (mem_alloc_profiling_enabled()) { - union codetag_ref *ref = get_page_tag_ref(page); - - alloc_tag_sub_check(ref); - if (ref) { - if (ref->ct) - tag = ct_to_alloc_tag(ref->ct); - put_page_tag_ref(ref); + union pgtag_ref_handle handle; + union codetag_ref ref; + + if (get_page_tag_ref(page, &ref, &handle)) { + alloc_tag_sub_check(&ref); + if (ref.ct) + tag = ct_to_alloc_tag(ref.ct); + put_page_tag_ref(handle); } } @@ -106,8 +124,6 @@ static inline void pgalloc_tag_sub_pages(struct alloc_tag *tag, unsigned int nr) #else /* CONFIG_MEM_ALLOC_PROFILING */ -static inline union codetag_ref *get_page_tag_ref(struct page *page) { return NULL; } -static inline void put_page_tag_ref(union codetag_ref *ref) {} static inline void clear_page_tag_ref(struct page *page) {} static inline void pgalloc_tag_add(struct page *page, struct task_struct *task, unsigned int nr) {}