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a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1765893810; bh=4j5utBX4YaZFXMornXvVJFK8v9wGb1f/34l9iOWO/8o=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Y9N8bunaxylY1ELiOjPh/ejm1t6KbVpf3y6rx36E/2boP5hz0Zs9HrwjtBhY3cFb3 rhf3UbrtHJCiaWwapSAqfg+VkG67pJ9hVV+FATfsU1LHWkMsp1ZQzADk8MmbZEdCyP h2IYzkYZTddQqvPUkQU41y94bo/VGc/ex8bZ6GWs= From: Thomas Ballasi To: Steven Rostedt , Masami Hiramatsu , Andrew Morton Cc: linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org Subject: [PATCH v2 2/2] mm: vmscan: add PIDs to vmscan tracepoints Date: Tue, 16 Dec 2025 06:02:52 -0800 Message-Id: <20251216140252.11864-3-tballasi@linux.microsoft.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20251216140252.11864-1-tballasi@linux.microsoft.com> References: <20251208181413.4722-1-tballasi@linux.microsoft.com> <20251216140252.11864-1-tballasi@linux.microsoft.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 7B2BB20018 X-Rspamd-Server: rspam03 X-Stat-Signature: bago5ti8duwceg9a7wwq858ffrdoo676 X-Rspam-User: X-HE-Tag: 1765893812-652572 X-HE-Meta: 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 ZraH47+f zB3QC23pk/DNdKZeIDMA3/6fmYb+AKIRzXC+Q++r20OMGXLyxfGBV1UjGx9cCvfjndjU5Iw/yVKWqLKnE4GjKQ5jLNE54It98Cd76xDQn7QRKa2Iz7sMkDTPqr3Ti8icTnVfiBtfs55QNE9hwuMVGWak6GQuANZvf86X3lqAtK5zZU/NhV5N7e+wO70Hz5pG49sx1TfXV4Hn0g1llBUnKz8TTwY81MhPzdfmXbgRd2u4GSHYhTMF3CoZEBj1kIE6zV+nl2e8B681NSQAAz+KuTwhLMwfirtaRCjHQ 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..315725f30b504 100644 --- a/include/trace/events/vmscan.h +++ b/include/trace/events/vmscan.h @@ -120,19 +120,22 @@ DECLARE_EVENT_CLASS(mm_vmscan_direct_reclaim_begin_template, TP_STRUCT__entry( __field( int, order ) + __field( int, pid ) __field( unsigned long, gfp_flags ) __field( unsigned short, memcg_id ) ), TP_fast_assign( __entry->order = order; + __entry->pid = in_task() ? current->pid : -1; __entry->gfp_flags = (__force unsigned long)gfp_flags; __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