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b=L8PcBBUpFdzvHPFizxhcHhG5EqcDUKZshr44jWAI7HgmkCmexyLoIuBGSPfTuIefc nNJ8TmZ1biEYvqeRza5qzGS6e3VnLdoOd9vcJvoct6jqfCXvubWT97MoiShzmkc8DD jZZxX3zhxlthN9Rk3R9xpkO9yFFJSAJMCPs4FL4A= From: Thomas Ballasi To: tballasi@linux.microsoft.com Cc: akpm@linux-foundation.org, axelrasmussen@google.com, david@kernel.org, hannes@cmpxchg.org, linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org, lorenzo.stoakes@oracle.com, mhiramat@kernel.org, mhocko@kernel.org, rostedt@goodmis.org, shakeel.butt@linux.dev, weixugc@google.com, yuanchu@google.com, zhengqi.arch@bytedance.com Subject: [PATCH v6 3/3] mm: vmscan: add PIDs to vmscan tracepoints Date: Fri, 13 Feb 2026 10:15:37 -0800 Message-Id: <20260213181537.54350-4-tballasi@linux.microsoft.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260213181537.54350-1-tballasi@linux.microsoft.com> References: <20260122182510.2126-1-tballasi@linux.microsoft.com> <20260213181537.54350-1-tballasi@linux.microsoft.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 9F2AD100003 X-Stat-Signature: rjndfbhbphiszhzbeybz4a3u6pc6fpgj X-Rspam-User: X-HE-Tag: 1771006552-823873 X-HE-Meta: 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 dJ+msDe3 BBJ5TnqlQsRJEtToPn1DCzx/xp7ITR/jkq+Y/J4Xdk1zDZcgXl5iTQHD/v35xMX3f/xn1o/MWWmul+84ufr2NR1wSdjiTWWNOF/Umudsv/r6BVzPDRiOp/PEm/90wVOqy3g8/5unLPZFk61wBZC9lYeoiAFFxUNKA7gKcPOa9z+JHNM+E1BYLI4ChISIh2QcvYgF+RvzURAswoY7Bzx0itMmPZ8M2UBagKKv36sUPdhZ55wqh6YsIRnGkF0lxK92+DIBbjV0/tniaQ6FkGtDoHXOjVXArj7ry5xzDwEqqS10Jqdk= 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 | 35 +++++++++++++++++++++++++---------- 1 file changed, 25 insertions(+), 10 deletions(-) diff --git a/include/trace/events/vmscan.h b/include/trace/events/vmscan.h index 1212f6a7c223e..a68b712ef757a 100644 --- a/include/trace/events/vmscan.h +++ b/include/trace/events/vmscan.h @@ -122,18 +122,22 @@ DECLARE_EVENT_CLASS(mm_vmscan_direct_reclaim_begin_template, __field( unsigned long, gfp_flags ) __field( u64, memcg_id ) __field( int, order ) + __field( int, pid ) ), TP_fast_assign( __entry->gfp_flags = (__force unsigned long)gfp_flags; __entry->order = order; + __entry->pid = current->pid; __entry->memcg_id = mem_cgroup_id(memcg); ), - TP_printk("order=%d gfp_flags=%s memcg_id=%llu", + TP_printk("order=%d gfp_flags=%s pid=%d memcg_id=%llu %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, @@ -168,16 +172,20 @@ DECLARE_EVENT_CLASS(mm_vmscan_direct_reclaim_end_template, TP_STRUCT__entry( __field( unsigned long, nr_reclaimed ) __field( u64, memcg_id ) + __field( int, pid ) ), TP_fast_assign( __entry->nr_reclaimed = nr_reclaimed; __entry->memcg_id = mem_cgroup_id(memcg); + __entry->pid = current->pid; ), - TP_printk("nr_reclaimed=%lu memcg_id=%llu", + TP_printk("nr_reclaimed=%lu pid=%d memcg_id=%llu %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, @@ -220,9 +228,10 @@ TRACE_EVENT(mm_shrink_slab_start, __field(unsigned long, cache_items) __field(unsigned long long, delta) __field(unsigned long, total_scan) + __field(u64, memcg_id) __field(int, priority) __field(int, nid) - __field(u64, memcg_id) + __field(int, pid) ), TP_fast_assign( @@ -236,19 +245,22 @@ TRACE_EVENT(mm_shrink_slab_start, __entry->priority = priority; __entry->nid = sc->nid; __entry->memcg_id = mem_cgroup_id(memcg); + __entry->pid = current->pid; ), - TP_printk("%pS %p: nid: %d memcg_id: %llu 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: %llu 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(u64, 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 = nid; __entry->retval = shrinker_retval; + __entry->pid = current->pid; __entry->memcg_id = mem_cgroup_id(memcg); ), - TP_printk("%pS %p: nid: %d memcg_id: %llu 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: %llu 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