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a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1767629118; bh=h/FTPDvAe0kBCPN0cxH7L3pGPOpB1MWPz7S11VhSCwY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=faemh3aaViYAj6Uua4LMH1ma42MSRKm+E1qg7J2vphI7woGFFz/AlV0t6kcA1ozrx XvTdlgMkeTAY/xgYMMp7NhSctV+chFLmDcczPRPVrJ0T4X7xf0cpsKEJ0bncc0BEao 0C49wXBtb/XgLiqqDGR4WqLfjFaZVCrYV6fevUGE= From: Thomas Ballasi To: tballasi@linux.microsoft.com Cc: akpm@linux-foundation.org, linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org, mhiramat@kernel.org, rostedt@goodmis.org Subject: [PATCH v3 2/2] mm: vmscan: add PIDs to vmscan tracepoints Date: Mon, 5 Jan 2026 08:04:23 -0800 Message-Id: <20260105160423.23708-3-tballasi@linux.microsoft.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260105160423.23708-1-tballasi@linux.microsoft.com> References: <20251216140252.11864-1-tballasi@linux.microsoft.com> <20260105160423.23708-1-tballasi@linux.microsoft.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Queue-Id: E33301C0004 X-Rspamd-Server: rspam10 X-Stat-Signature: n5wzatoz59uxp567nta4re6fmop4rxnw X-HE-Tag: 1767629119-101047 X-HE-Meta: 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 9Cd66ARN BTH//OiI+4zlXzGc= 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 | 33 ++++++++++++++++++++++++--------- 1 file changed, 24 insertions(+), 9 deletions(-) diff --git a/include/trace/events/vmscan.h b/include/trace/events/vmscan.h index 93a9a9ba9405d..d438abfa03ebb 100644 --- a/include/trace/events/vmscan.h +++ b/include/trace/events/vmscan.h @@ -121,19 +121,23 @@ DECLARE_EVENT_CLASS(mm_vmscan_direct_reclaim_begin_template, TP_STRUCT__entry( __field( unsigned long, gfp_flags ) __field( int, order ) + __field( int, pid ) __field( unsigned short, memcg_id ) ), TP_fast_assign( __entry->gfp_flags = (__force unsigned long)gfp_flags; __entry->order = order; + __entry->pid = current->pid; __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 %s", __entry->order, show_gfp_flags(__entry->gfp_flags), - __entry->memcg_id) + __entry->pid, + __entry->memcg_id, ++ __event_in_irq() ? "(in-irq)" : "") ); DEFINE_EVENT(mm_vmscan_direct_reclaim_begin_template, mm_vmscan_direct_reclaim_begin, @@ -167,17 +171,21 @@ 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 = current->pid; __entry->memcg_id = memcg_id; ), - TP_printk("nr_reclaimed=%lu memcg_id=%u", + TP_printk("nr_reclaimed=%lu pid=%d memcg_id=%u %s", __entry->nr_reclaimed, - __entry->memcg_id) + __entry->pid, + __entry->memcg_id, + __event_in_irq() ? "(in-irq)" : "") ); DEFINE_EVENT(mm_vmscan_direct_reclaim_end_template, mm_vmscan_direct_reclaim_end, @@ -222,6 +230,7 @@ TRACE_EVENT(mm_shrink_slab_start, __field(unsigned long, total_scan) __field(int, priority) __field(int, nid) + __field(int, pid) __field(unsigned short, memcg_id) ), @@ -235,20 +244,23 @@ TRACE_EVENT(mm_shrink_slab_start, __entry->total_scan = total_scan; __entry->priority = priority; __entry->nid = sc->nid; + __entry->pid = current->pid; __entry->memcg_id = sc->memcg ? cgroup_id(sc->memcg->css.cgroup) : 0; ), - 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 %s", __entry->shrink, __entry->shr, __entry->nid, + __entry->pid, __entry->memcg_id, __entry->nr_objects_to_shrink, show_gfp_flags(__entry->gfp_flags), __entry->cache_items, __entry->delta, __entry->total_scan, - __entry->priority) + __entry->priority, ++ __event_in_irq() ? "(in-irq)" : "") ); TRACE_EVENT(mm_shrink_slab_end, @@ -266,29 +278,32 @@ TRACE_EVENT(mm_shrink_slab_end, __field(long, total_scan) __field(int, nid) __field(int, retval) + __field(int, pid) __field(unsigned short, memcg_id) ), TP_fast_assign( __entry->shr = shr; - __entry->shrink = shr->scan_objects; __entry->unused_scan = unused_scan_cnt; __entry->new_scan = new_scan_cnt; __entry->total_scan = total_scan; __entry->nid = sc->nid; __entry->retval = shrinker_retval; + __entry->pid = current->pid; __entry->memcg_id = cgroup_id(sc->memcg->css.cgroup); ), - 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 %s", __entry->shrink, __entry->shr, __entry->nid, + __entry->pid, __entry->memcg_id, __entry->unused_scan, __entry->new_scan, __entry->total_scan, - __entry->retval) + __entry->retval, ++ __event_in_irq() ? "(in-irq)" : "") ); TRACE_EVENT(mm_vmscan_lru_isolate, -- 2.33.8