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c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1765217666; bh=q6BkiwIwtDFty4kL/vcoF4uK9prjj6wuzxRHvEPa1Bk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=gkOXlJLwdBC6u2WwsteOBjVhNuNJ9KcyPx9CtSfJ0mJRZgTZcxHS+XP9tbeD2RXxh HH8YuymnL1pupRUjxI0hU2RgbrOGVVR+WLJ5Dz9J/4ayzWIMC/RwzOPViyyFaN6vJ/ eJElxEVKn2QSwKcSiaM0OaRoMFIRzjnDb9XgXL7Y= From: Thomas Ballasi To: Steven Rostedt , Masami Hiramatsu , Andrew Morton Cc: linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org Subject: [PATCH 2/2] mm: vmscan: add PIDs to vmscan tracepoints Date: Mon, 8 Dec 2025 10:14:13 -0800 Message-Id: <20251208181413.4722-3-tballasi@linux.microsoft.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20251208181413.4722-1-tballasi@linux.microsoft.com> References: <20251208181413.4722-1-tballasi@linux.microsoft.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: D88B6180007 X-Stat-Signature: fj17h7k8jzh19ktisqag6xkgta3zjusc X-Rspam-User: X-Rspamd-Server: rspam04 X-HE-Tag: 1765217667-430550 X-HE-Meta: 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 3yNw3JWX rpzOqPQXGWsEUgmsDWsMPplLFJMjEmrmg8sNuKnax+nJOksrZZ//uQ2A6hGvb7KRV5fBOTsD9jspJMvG3BsPv1UKRtJHuP1s3d8wIqAWVrC0oJSx9VC2A5+s9KXpfPtfOcInrmyXKIH+du5rrGJPd2TenXaI4a3D/0JhkCrQWUp+2SIitiyw5J6X4td9/a/o0cmrOLiOmkME8gC7Vo5Wni4dgmVAgElubpHOrs7FHafLAcjIQrlxNmXkK/nQ11V7xNLkg0R8oYCyYwWax2q1Zdhi2t1+Hg7iMQizz 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: The changes aims at adding additionnal tracepoints variables to help debuggers attribute them to specific processes. The PID field uses in_task() to reliably detect when we're in process context and can safely access current->pid. When not in process context (such as in interrupt or in an asynchronous RCU context), the field is set to -1 as a sentinel value. Signed-off-by: Thomas Ballasi --- include/trace/events/vmscan.h | 20 ++++++++++++++++---- 1 file changed, 16 insertions(+), 4 deletions(-) diff --git a/include/trace/events/vmscan.h b/include/trace/events/vmscan.h index afc9f80d03f34..eddb4e75e2e23 100644 --- a/include/trace/events/vmscan.h +++ b/include/trace/events/vmscan.h @@ -121,18 +121,21 @@ DECLARE_EVENT_CLASS(mm_vmscan_direct_reclaim_begin_template, TP_STRUCT__entry( __field( int, order ) __field( unsigned long, gfp_flags ) + __field( int, pid ) __field( unsigned short, memcg_id ) ), TP_fast_assign( __entry->order = order; __entry->gfp_flags = (__force unsigned long)gfp_flags; + __entry->pid = in_task() ? current->pid : -1; __entry->memcg_id = memcg_id; ), - TP_printk("order=%d gfp_flags=%s memcg_id=%u", + TP_printk("order=%d gfp_flags=%s pid=%d memcg_id=%u", __entry->order, show_gfp_flags(__entry->gfp_flags), + __entry->pid, __entry->memcg_id) ); @@ -167,16 +170,19 @@ DECLARE_EVENT_CLASS(mm_vmscan_direct_reclaim_end_template, TP_STRUCT__entry( __field( unsigned long, nr_reclaimed ) + __field( int, pid ) __field( unsigned short, memcg_id ) ), TP_fast_assign( __entry->nr_reclaimed = nr_reclaimed; + __entry->pid = in_task() ? current->pid : -1; __entry->memcg_id = memcg_id; ), - TP_printk("nr_reclaimed=%lu memcg_id=%u", + TP_printk("nr_reclaimed=%lu pid=%d memcg_id=%u", __entry->nr_reclaimed, + __entry->pid, __entry->memcg_id) ); @@ -216,6 +222,7 @@ TRACE_EVENT(mm_shrink_slab_start, __field(struct shrinker *, shr) __field(void *, shrink) __field(int, nid) + __field(int, pid) __field(unsigned short, memcg_id) __field(long, nr_objects_to_shrink) __field(unsigned long, gfp_flags) @@ -229,6 +236,7 @@ TRACE_EVENT(mm_shrink_slab_start, __entry->shr = shr; __entry->shrink = shr->scan_objects; __entry->nid = sc->nid; + __entry->pid = in_task() ? current->pid : -1; __entry->memcg_id = sc->memcg ? mem_cgroup_id(sc->memcg) : 0; __entry->nr_objects_to_shrink = nr_objects_to_shrink; __entry->gfp_flags = (__force unsigned long)sc->gfp_mask; @@ -238,10 +246,11 @@ TRACE_EVENT(mm_shrink_slab_start, __entry->priority = priority; ), - TP_printk("%pS %p: nid: %d memcg_id: %u objects to shrink %ld gfp_flags %s cache items %ld delta %lld total_scan %ld priority %d", + TP_printk("%pS %p: nid: %d pid: %d memcg_id: %u objects to shrink %ld gfp_flags %s cache items %ld delta %lld total_scan %ld priority %d", __entry->shrink, __entry->shr, __entry->nid, + __entry->pid, __entry->memcg_id, __entry->nr_objects_to_shrink, show_gfp_flags(__entry->gfp_flags), @@ -261,6 +270,7 @@ TRACE_EVENT(mm_shrink_slab_end, TP_STRUCT__entry( __field(struct shrinker *, shr) __field(int, nid) + __field(int, pid) __field(unsigned short, memcg_id) __field(void *, shrink) __field(long, unused_scan) @@ -272,6 +282,7 @@ TRACE_EVENT(mm_shrink_slab_end, TP_fast_assign( __entry->shr = shr; __entry->nid = sc->nid; + __entry->pid = in_task() ? current->pid : -1; __entry->memcg_id = sc->memcg ? mem_cgroup_id(sc->memcg) : 0; __entry->shrink = shr->scan_objects; __entry->unused_scan = unused_scan_cnt; @@ -280,10 +291,11 @@ TRACE_EVENT(mm_shrink_slab_end, __entry->total_scan = total_scan; ), - TP_printk("%pS %p: nid: %d memcg_id: %u unused scan count %ld new scan count %ld total_scan %ld last shrinker return val %d", + TP_printk("%pS %p: nid: %d pid: %d memcg_id: %u unused scan count %ld new scan count %ld total_scan %ld last shrinker return val %d", __entry->shrink, __entry->shr, __entry->nid, + __entry->pid, __entry->memcg_id, __entry->unused_scan, __entry->new_scan, -- 2.33.8