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b=p+ImZKNTiJPUfunSUwmJEsSQtqwL15K6ZYgS2IPRZl2iWxj6Ikg/fmyjW/3JoDRtB zw83fYj6Yz+HdHJ+DJlHQMQcbxAVJKEIFM8/esOsHA985pMONs+UuLOHAfxkmgfJwv JkIQ2XvOl8MehFhiuRW72rgupSS1wEf/oEuKKG/I= 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 v5 3/3] mm: vmscan: add PIDs to vmscan tracepoints Date: Thu, 22 Jan 2026 10:25:10 -0800 Message-Id: <20260122182510.2126-4-tballasi@linux.microsoft.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260122182510.2126-1-tballasi@linux.microsoft.com> References: <20260115123809.2257-1-tballasi@linux.microsoft.com> <20260122182510.2126-1-tballasi@linux.microsoft.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: C3F2D1C0009 X-Stat-Signature: 6ujwyn49y7c5wkqd6dk9ymheih8gxajj X-Rspam-User: X-Rspamd-Server: rspam02 X-HE-Tag: 1769106338-275021 X-HE-Meta: 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 gvDHyweW O2VoyyMheIJ2Ifp/L844mbI1IjoADE/ndGTK7O7Y3zwVELAzopm9myBwOrG29D7oa8uvgxUdig4d2/84W2TfLMeY9t2pm2jistljjt/KT0GI9kWZFLu1er2aZE6TKafmPCFuW/UEAsw1ZqO5rTxd3yfAwHmljqeBvAQbFK6sqPE4eoNp9YtQff3BfWHulH+4b8VFhRbS+m0J1ttaB1hKccnhvl4338LSZOS/eNxCh2qFn9kuNpRqj1Zy9ZkiGZRAtqu+TCL8ZSTlhtF5FISvT2wV5rH2S/CxnLV9R 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..c7f7621e48af5 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