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ast@kernel.org, ziy@nvidia.com, yuzhao@google.com, baolin.wang@linux.alibaba.com, usamaarif642@gmail.com, joel.granados@kernel.org, richard.weiyang@gmail.com, geert+renesas@glider.be, tim.c.chen@linux.intel.com, linux@treblig.org, alexander.shishkin@linux.intel.com, lillian@star-ark.net, chenhuacai@kernel.org, francesco@valla.it, guoweikang.kernel@gmail.com, link@vivo.com, jpoimboe@kernel.org, masahiroy@kernel.org, brauner@kernel.org, thomas.weissschuh@linutronix.de, oleg@redhat.com, mjguzik@gmail.com, andrii@kernel.org, wangfushuai@baidu.com, linux-doc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-media@vger.kernel.org, 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 Subject: [PATCH v17 40/47] dept: introduce event_site() to disable event tracking if it's recoverable Date: Thu, 2 Oct 2025 17:12:40 +0900 Message-Id: <20251002081247.51255-41-byungchul@sk.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20251002081247.51255-1-byungchul@sk.com> References: <20251002081247.51255-1-byungchul@sk.com> X-Brightmail-Tracker: H4sIAAAAAAAAAzWSb2xTZRTGfe9979u7supNwXgFFdNYJROYykYOiRg/mPCqMSFijIpGGnez FrZBulGYoo5u1WUbc9R0k63MjjKy0QKjZcomk7HBYjfIWsrgBkZZZX9YttJktpsMRm0hfvvl eZ7znJzk8Kxa5pbyhoIiyVigy9MQJVZG0ptWPZ0V0r9W285DPFaOwX7CTaDcc4AD/3EXgrn7 DSxYOhIYFqx9Cojdu6GARFcfgtqAlQX3qb0M/NP2kMBU7wwCW3iUQN3kXgzRI1UI6scbFDB5 YQNEbv3BwbXZaQSj3T8i+PWQl8CpvhCCrhYzgbGadhaCo0/ClXiUgM9WSSASsDNwt42Aw9zF Qe1BD4aOkU4FBKYeMDBca2XA5fkguYlAQ10pAxedwxgaLgU5OB4Z5MAXusrB1LiVQOxKmAF3 1TgL5Z1xDJ7bSaPph8MYDjQOEzjT5cNQvhBDEOy0E6hqa+cg5E4kL+8e4OCyy4/hxITMgK++ FcNg5zEOwiMyB95LF1mYrV4G/v37OJBrxtDbOXTOUo3pUe9vDLVcXiDU3ehG9P68FdFYcylL e6ejLC3z7qLNA9OEzseHCO0/JNKO+psKWvbndQV1eHZSb0sGdZ6ZZDau/Ez5Zo6UZzBJxsy3 tij1F/odeMftF3b3nl1fgprFCpTGi0KW6KgMKioQ/4in5tenZCK8IsryPTbFS4QXRe++cS7F 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mob1yYMQseXDgHOKBv/vZgxt8yOiL8yIXzHewnyz+z7BG//eoPiWuhbEh9dMiF9q0pO8sTy6 9s2FSN7gvso3eeYofm15lOK73tswP9jA8RXDaXxntZ/mDd0v6G+P/iA+niPkKgsETXpmtljR P2jDl998XNj36EQxauLKEMNw7CFudu1EGYpjKPZT7tmzVTLG8WwS5/4tKIoxyXr2cGPefbH4 Tlbgplqvx2TMJnONr1foGEvYI1xEdxfFmGP3ck5Xz39n4qK6b9KDYyxlD3PGkIEoR2Ib2tKM 4pXqgjy5Mvfwfq1KUaRWFu6/mJ/XjqKvZP95veIPtOTL6kUsg2RbJd5kv0Iqkhdoi/J6EceQ snhJtmNcIZXkyIt+EjT5FzQ/5graXpTIYFmC5OQ5IVvKXpJfEVSCcFnQ/O8STNzuYnQmaHIl ln1lw4spnYmXVMeqrB69z7Bz1InSdYHztpyZNPXp9GFLpa6wP/Xi8+/eyk9Vf57RzagyPurY 1fxL6WY4tcOxHQ2V/SXOHEtZufXZl63mPTsMfFKv4hNjf2Zove7q0LUKV1ZBd73j+9GEpH3o rP6cgkg/EBbejAzm3zwvw1qF/GAqqdHKPwDtVNImRgMAAA== X-CFilter-Loop: Reflected Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" With multi event sites for a single wait, dept allows to skip tracking an event that is recoverable by other recover paths. Introduce an API, event_site(), to skip tracking the event in the case. Signed-off-by: Byungchul Park --- include/linux/dept.h | 30 ++++++++++++++++++++++++++++++ include/linux/sched.h | 6 ++++++ kernel/dependency/dept.c | 20 ++++++++++++++++++++ 3 files changed, 56 insertions(+) diff --git a/include/linux/dept.h b/include/linux/dept.h index 25fdd324614a..0ac13129f308 100644 --- a/include/linux/dept.h +++ b/include/linux/dept.h @@ -487,6 +487,31 @@ extern void dept_task_exit(struct task_struct *t); extern void dept_free_range(void *start, unsigned int sz); extern void dept_mark_event_site_used(void *start, void *end); =20 +extern void disable_event_track(void); +extern void enable_event_track(void); + +#define event_site(es, evt_func, ...) \ +do { \ + unsigned long _flags; \ + bool _disable; \ + \ + local_irq_save(_flags); \ + dept_event_site_used(es); \ + /* \ + * If !list_empty(&(es)->dept_head), the event site can be \ + * recovered by others. Do not track event dependency if so. \ + */ \ + _disable =3D !list_empty(&(es)->dep_head); \ + if (_disable) \ + disable_event_track(); \ + \ + evt_func(__VA_ARGS__); \ + \ + if (_disable) \ + enable_event_track(); \ + local_irq_restore(_flags); \ +} while (0) + extern void dept_map_init(struct dept_map *m, struct dept_key *k, int sub_= u, const char *n); extern void dept_map_reinit(struct dept_map *m, struct dept_key *k, int su= b_u, const char *n); extern void dept_ext_wgen_init(struct dept_ext_wgen *ewg); @@ -550,6 +575,11 @@ struct dept_event_site { }; #define dept_task_exit(t) do { } while (0) #define dept_free_range(s, sz) do { } while (0) #define dept_mark_event_site_used(s, e) do { } while (0) +#define event_site(es, evt_func, ...) \ +do { \ + (void)(es); \ + evt_func(__VA_ARGS__); \ +} while (0) =20 #define dept_map_init(m, k, su, n) do { (void)(n); (void)(k); } while (0) #define dept_map_reinit(m, k, su, n) do { (void)(n); (void)(k); } while = (0) diff --git a/include/linux/sched.h b/include/linux/sched.h index a01c10f28dfd..24a9dc9d6f5f 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -876,6 +876,11 @@ struct dept_task { */ int missing_ecxt; =20 + /* + * not to track events + */ + int disable_event_track_cnt; + /* * for tracking IRQ-enable state */ @@ -913,6 +918,7 @@ struct dept_task { .stage_wait_stack =3D NULL, \ .stage_lock =3D (arch_spinlock_t)__ARCH_SPIN_LOCK_UNLOCKED,\ .missing_ecxt =3D 0, \ + .disable_event_track_cnt =3D 0, \ .hardirqs_enabled =3D false, \ .softirqs_enabled =3D false, \ .task_exit =3D false, \ diff --git a/kernel/dependency/dept.c b/kernel/dependency/dept.c index 07d883579269..3c3ec2701bd6 100644 --- a/kernel/dependency/dept.c +++ b/kernel/dependency/dept.c @@ -2573,6 +2573,23 @@ static void __dept_wait(struct dept_map *m, unsigned= long w_f, } } =20 +void disable_event_track(void) +{ + dept_task()->disable_event_track_cnt++; +} +EXPORT_SYMBOL_GPL(disable_event_track); + +void enable_event_track(void) +{ + dept_task()->disable_event_track_cnt--; +} +EXPORT_SYMBOL_GPL(enable_event_track); + +static bool event_track_disabled(void) +{ + return !!dept_task()->disable_event_track_cnt; +} + /* * Called between dept_enter() and dept_exit(). */ @@ -2585,6 +2602,9 @@ static void __dept_event(struct dept_map *m, struct d= ept_map *real_m, struct dept_key *k; int e; =20 + if (event_track_disabled()) + return; + e =3D find_first_bit(&e_f, DEPT_MAX_SUBCLASSES_EVT); =20 if (DEPT_WARN_ON(e >=3D DEPT_MAX_SUBCLASSES_EVT)) --=20 2.17.1