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linaro-mm-sig@lists.linaro.org, linux-i2c@vger.kernel.org, linux-arch@vger.kernel.org, linux-modules@vger.kernel.org, rcu@vger.kernel.org, linux-nfs@vger.kernel.org, linux-rt-devel@lists.linux.dev, 2407018371@qq.com, dakr@kernel.org, miguel.ojeda.sandonis@gmail.com, neilb@ownmail.net, bagasdotme@gmail.com, wsa+renesas@sang-engineering.com, dave.hansen@intel.com, geert@linux-m68k.org, ojeda@kernel.org, alex.gaynor@gmail.com, gary@garyguo.net, bjorn3_gh@protonmail.com, lossin@kernel.org, a.hindborg@kernel.org, aliceryhl@google.com, tmgross@umich.edu, rust-for-linux@vger.kernel.org Subject: [PATCH v19 36/40] dept: track PG_writeback with dept Date: Mon, 6 Jul 2026 15:19:24 +0900 Message-Id: <20260706061928.66713-37-byungchul@sk.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20260706061928.66713-1-byungchul@sk.com> References: <20260706061928.66713-1-byungchul@sk.com> X-Brightmail-Tracker: H4sIAAAAAAAAAzWSbUxTZxTH99z7PPdeKjXXasJFluG6uC3MMVxwnixz4+Nl7oPJTKZui9Zx 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4ei6QOeUV43NCIjOd8mY0yKSgYt7Rw4E4mlpkHljFfvjOddDHev4h3GsCUUoaONSqXhjwkjdVfXnjTZ6rJq25k6ZNeJT+A5ucWQNLj0n2FC5/GCZlpmUtBYoNwNbZB64w7SKiEdSgdb9A+PK/iUewt6fEzb522unUUIbHhYoySv8BnXX5wEOk/XaTdpC5NGJHAthsCD8p40uTITzEbzog9DdSgg== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Makes dept able to track PG_writeback waits and events, which will be useful in practice. Signed-off-by: Byungchul Park --- include/linux/mm_types.h | 1 + include/linux/page-flags.h | 7 +++++++ mm/filemap.c | 6 +++++- mm/mm_init.c | 1 + 4 files changed, 14 insertions(+), 1 deletion(-) diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index e25d09f3dfa9..81dc9999090a 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -222,6 +222,7 @@ struct page { #endif struct dept_page_usage usage; struct dept_ext_wgen pg_locked_wgen; + struct dept_ext_wgen pg_writeback_wgen; } _struct_page_alignment; /* diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h index 0b0655354b08..ec736811a2c6 100644 --- a/include/linux/page-flags.h +++ b/include/linux/page-flags.h @@ -203,6 +203,7 @@ enum pageflags { #include extern struct dept_map pg_locked_map; +extern struct dept_map pg_writeback_map; static inline void dept_set_page_usage(struct page *p, unsigned int new_type) @@ -292,6 +293,8 @@ static inline void dept_page_set_bit(struct page *p, int bit_nr) if (bit_nr == PG_locked) dept_request_event(&pg_locked_map, &p->pg_locked_wgen); + else if (bit_nr == PG_writeback) + dept_request_event(&pg_writeback_map, &p->pg_writeback_wgen); } static inline void dept_page_clear_bit(struct page *p, int bit_nr) @@ -300,6 +303,8 @@ static inline void dept_page_clear_bit(struct page *p, int bit_nr) if (bit_nr == PG_locked) dept_event(&pg_locked_map, evt_f, _RET_IP_, __func__, &p->pg_locked_wgen); + else if (bit_nr == PG_writeback) + dept_event(&pg_writeback_map, evt_f, _RET_IP_, __func__, &p->pg_writeback_wgen); } static inline void dept_page_wait_on_bit(struct page *p, int bit_nr) @@ -311,6 +316,8 @@ static inline void dept_page_wait_on_bit(struct page *p, int bit_nr) if (bit_nr == PG_locked) dept_wait(&pg_locked_map, evt_f, _RET_IP_, __func__, 0, -1L); + else if (bit_nr == PG_writeback) + dept_wait(&pg_writeback_map, evt_f, _RET_IP_, __func__, 0, -1L); } static inline void dept_folio_set_bit(struct folio *f, int bit_nr) diff --git a/mm/filemap.c b/mm/filemap.c index c0bff1e08a28..e3aa2754da3f 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -1197,7 +1197,7 @@ static void folio_wake_bit(struct folio *folio, int bit_nr) * dept_page_clear_bit() being called multiple times is harmless. * The worst case is to miss some dependencies but it's okay. */ - if (bit_nr == PG_locked) + if (bit_nr == PG_locked || bit_nr == PG_writeback) dept_page_clear_bit(&folio->page, bit_nr); spin_lock_irqsave(&q->lock, flags); @@ -1254,6 +1254,9 @@ static inline bool folio_trylock_flag(struct folio *folio, int bit_nr, struct dept_map __maybe_unused pg_locked_map = DEPT_MAP_INITIALIZER(pg_locked_map, NULL); EXPORT_SYMBOL(pg_locked_map); +struct dept_map __maybe_unused pg_writeback_map = DEPT_MAP_INITIALIZER(pg_writeback_map, NULL); +EXPORT_SYMBOL(pg_writeback_map); + static inline int folio_wait_bit_common(struct folio *folio, int bit_nr, int state, enum behavior behavior) { @@ -1697,6 +1700,7 @@ void folio_end_writeback_no_dropbehind(struct folio *folio) folio_rotate_reclaimable(folio); } + dept_page_clear_bit(&folio->page, PG_writeback); if (__folio_end_writeback(folio)) folio_wake_bit(folio, PG_writeback); diff --git a/mm/mm_init.c b/mm/mm_init.c index 66b68c02d8d4..2695d7b3b089 100644 --- a/mm/mm_init.c +++ b/mm/mm_init.c @@ -589,6 +589,7 @@ void __meminit __init_single_page(struct page *page, unsigned long pfn, page_cpupid_reset_last(page); page_kasan_tag_reset(page); dept_ext_wgen_init(&page->pg_locked_wgen); + dept_ext_wgen_init(&page->pg_writeback_wgen); INIT_LIST_HEAD(&page->lru); #ifdef WANT_PAGE_VIRTUAL -- 2.17.1