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b=rapo8Ul/uEa5jDPQ8S6WmuQBVUYyNDQ/plF0jMu+OJqfd+nUo8/AXNNyV6oGHzmVj hYWKUmKi57O39oaB/eXc4xTpqRMdVk8kyUIb+JOc+atFw9ezbK0+o0oNFoWwGXXo+s JVsqI9xYHs9JKlatmx+1rYTPPeV4gdBa++0xuQUM= 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 v4 3/3] mm: vmscan: add PIDs to vmscan tracepoints Date: Thu, 15 Jan 2026 04:38:09 -0800 Message-Id: <20260115123809.2257-4-tballasi@linux.microsoft.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260115123809.2257-1-tballasi@linux.microsoft.com> References: <20260105160423.23708-1-tballasi@linux.microsoft.com> <20260115123809.2257-1-tballasi@linux.microsoft.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: pp4t9uyw8zmzis8xmobp8wfqs4yrienr X-Rspam-User: X-Rspamd-Queue-Id: EB92380002 X-Rspamd-Server: rspam08 X-HE-Tag: 1768480703-152907 X-HE-Meta: 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 vcjb8xGO La7J8VkJeZ1OtFA/FQfwHD/rXnU3ujZzLWYOb2WXrNJislfXxQZOtfVWvSSbAM5XXG5d/dMylxwJF8qvwm9kU8auJcCxZEBDWHewOy5yF5i+aGlna9gMM1VVBRysPYWFBRKQCNCC/JM4qEx0TVmIAwP8buGd3lN2gaFkZjJmDyR+7fIbris3F+nCyoyoLGACs7lx6Xm5cPJl4RJEovjQ5PBsrfpO/g32WBkDSu8zJ/0TZkBpbNzd+QLOdosF9GmJ4zyBdMeVuzJlSyJZ1aAwD5c1+lxKuOzLVZuhG 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 20160e79eb0d7..288589e3364b0 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 = memcg_id; ), - 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 = memcg_id; + __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 = memcg_id; + __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 = memcg_id; ), - 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