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b=BzGSn2Mea1DCzUaQX4FnGBzWF8V5Zb+5TqtiFyyZOu2Rip3k1NG8/90nE2PRZ6HAk B7N93NH0/n36AO1V0NJSIPDz94+O7wlPUiW+Yyak+iy8U8F17P72m5JIMp1DkxhX+v R6AFMzz37t3hbdktYgoIW+WsmBvofT4r3oNp77Ww= 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 v7 3/3] mm: vmscan: add PIDs to vmscan tracepoints Date: Mon, 23 Feb 2026 09:15:44 -0800 Message-Id: <20260223171544.4750-4-tballasi@linux.microsoft.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260223171544.4750-1-tballasi@linux.microsoft.com> References: <20260213181537.54350-1-tballasi@linux.microsoft.com> <20260223171544.4750-1-tballasi@linux.microsoft.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Queue-Id: 0316910001F X-Rspamd-Server: rspam02 X-Stat-Signature: k6mufb59h4zyg7ii3797s3qdut5m11ba X-HE-Tag: 1771866952-268345 X-HE-Meta: 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 uv1gLAOt P6c4Hq72pIlP9lx3TDqVTyUb8wdOqfDkODD/W2OeMhb3eWyPsSWyN6BnwZzDRXz7opJkEePUUug90pl9cgj3M2uPOBGsfOPTIpwG0Xq8FmpfWYDy+QxAFW09WwxJ+SblDMIAAQVCxGL30CccmN1yuwtCpg3FFimseuipSUTcHFY4Yjfdr/nR2qN7RHdaY1D31s0zDvntkF6ovXXxZZzE0GF8bzVRjsb/z2jmREj4FkHk8DP+0y+ObRHgbRT/TOQOBsx0ZO71px64fYTfYI91526j+tHg/B13pZI3ZzKIwtu9Oizw= 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 | 34 +++++++++++++++++++++++++--------- 1 file changed, 25 insertions(+), 9 deletions(-) diff --git a/include/trace/events/vmscan.h b/include/trace/events/vmscan.h index 1212f6a7c223e..15b31281f0955 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, @@ -266,6 +278,7 @@ TRACE_EVENT(mm_shrink_slab_end, __field(long, total_scan) __field(int, nid) __field(int, retval) + __field(int, pid) __field(u64, memcg_id) ), @@ -277,18 +290,21 @@ TRACE_EVENT(mm_shrink_slab_end, __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