From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AE2232517B9 for ; Tue, 6 Jan 2026 03:38:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767670728; cv=none; b=bZ+KX0ifmoAI23P93XAZA/5BKyXlaKZZNqzYeEsGdHYNywFUubA4WjqVSww87ptEfRshrILT0DUTYRQu5qxtV7KcEqdt9R9T35gXblJVlI/YQRTZVzUBykIw3MRo/rTazFYduXKmDMnm6bNlgkX+NVjyR3g68hbjWnElQr8VffM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767670728; c=relaxed/simple; bh=QcfsXG6/4Ih+/b+UQwbK1riOtXOd71m2qU2HJNHhTig=; h=Date:To:From:Subject:Message-Id; b=e2nPRY5mCrExspPFCR5qHZoc+6JqOlnIs02/gUhQpzi0G4eBwutEACrfvSRZzR+pv5qX5goOkxCs9/qMTjtAXxJt3hdSv6VMV3ofpha3Ruo/tcCRh3tI1/VYF8kAXc2uVWH2PYUoK1jY8Nm1K6Blffrox0YV06cK2c3P9RTeHZQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=rJ7OCVRE; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="rJ7OCVRE" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4178CC116D0; Tue, 6 Jan 2026 03:38:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1767670728; bh=QcfsXG6/4Ih+/b+UQwbK1riOtXOd71m2qU2HJNHhTig=; h=Date:To:From:Subject:From; b=rJ7OCVREZ818pUXDC4En9o5BW1VrmlUA81OVxypAnwEBIrB7A46dUOgnJmf9V8ngA Umzx2AKqqje/Hu7eLeaJa5w0qKMlTgomlCZv1O9FpxdShxXLkVnyKBz0HkceC5s8/3 2HBdmCrBDBMJFpuOFIAoD96xpIvovD65f6xZLIiM= Date: Mon, 05 Jan 2026 19:38:47 -0800 To: mm-commits@vger.kernel.org,zhengqi.arch@bytedance.com,yuanchu@google.com,weixugc@google.com,shakeel.butt@linux.dev,rostedt@goodmis.org,roman.gushchin@linux.dev,muchun.song@linux.dev,mhocko@kernel.org,mhiramat@kernel.org,mathieu.desnoyers@efficios.com,lorenzo.stoakes@oracle.com,hannes@cmpxchg.org,david@kernel.org,david@fromorbit.com,axelrasmussen@google.com,tballasi@linux.microsoft.com,akpm@linux-foundation.org From: Andrew Morton Subject: + mm-vmscan-add-pids-to-vmscan-tracepoints.patch added to mm-new branch Message-Id: <20260106033848.4178CC116D0@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: mm: vmscan: add PIDs to vmscan tracepoints has been added to the -mm mm-new branch. Its filename is mm-vmscan-add-pids-to-vmscan-tracepoints.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-vmscan-add-pids-to-vmscan-tracepoints.patch This patch will later appear in the mm-new branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Note, mm-new is a provisional staging ground for work-in-progress patches, and acceptance into mm-new is a notification for others take notice and to finish up reviews. Please do not hesitate to respond to review feedback and post updated versions to replace or incrementally fixup patches in mm-new. The mm-new branch of mm.git is not included in linux-next Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via various branches at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there most days ------------------------------------------------------ From: Thomas Ballasi Subject: mm: vmscan: add PIDs to vmscan tracepoints Date: Mon, 5 Jan 2026 08:04:23 -0800 The changes aim at adding additional 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. Link: https://lkml.kernel.org/r/20260105160423.23708-3-tballasi@linux.microsoft.com Signed-off-by: Thomas Ballasi Cc: Axel Rasmussen Cc: Dave Chinner Cc: David Hildenbrand Cc: Johannes Weiner Cc: Lorenzo Stoakes Cc: Masami Hiramatsu Cc: Mathieu Desnoyers Cc: Michal Hocko Cc: Muchun Song Cc: Qi Zheng Cc: Roman Gushchin Cc: Shakeel Butt Cc: Steven Rostedt Cc: Wei Xu Cc: Yuanchu Xie Signed-off-by: Andrew Morton --- include/trace/events/vmscan.h | 33 +++++++++++++++++++++++--------- 1 file changed, 24 insertions(+), 9 deletions(-) --- a/include/trace/events/vmscan.h~mm-vmscan-add-pids-to-vmscan-tracepoints +++ a/include/trace/events/vmscan.h @@ -121,19 +121,23 @@ DECLARE_EVENT_CLASS(mm_vmscan_direct_rec 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_rec 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, _ Patches currently in -mm which might be from tballasi@linux.microsoft.com are mm-vmscan-add-cgroup-ids-to-vmscan-tracepoints.patch mm-vmscan-add-pids-to-vmscan-tracepoints.patch