linux-kernel - Re: [PATCH mm v6] mm/tracing: add 'accounted' entry into output of allocation tracepoints

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Date:   Wed, 15 Jun 2022 11:41:48 +0200
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Vasily Averin <vvs@...nvz.org>
Cc:     kernel@...nvz.org, linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        Shakeel Butt <shakeelb@...gle.com>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Michal Koutný <mkoutny@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>, Michal Hocko <mhocko@...e.com>,
        Muchun Song <songmuchun@...edance.com>,
        Hyeonggon Yoo <42.hyeyoo@...il.com>,
        Matthew Wilcox <willy@...radead.org>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        David Rientjes <rientjes@...gle.com>,
        Pekka Enberg <penberg@...nel.org>,
        Christoph Lameter <cl@...ux.com>, cgroups@...r.kernel.org
Subject: Re: [PATCH mm v6] mm/tracing: add 'accounted' entry into output of
 allocation tracepoints

On 6/3/22 05:21, Vasily Averin wrote:
> Slab caches marked with SLAB_ACCOUNT force accounting for every
> allocation from this cache even if __GFP_ACCOUNT flag is not passed.
> Unfortunately, at the moment this flag is not visible in ftrace output,
> and this makes it difficult to analyze the accounted allocations.
> 
> This patch adds boolean "accounted" entry into trace output,
> and set it to 'true' for calls used __GFP_ACCOUNT flag and
> for allocations from caches marked with SLAB_ACCOUNT.
> Set it to 'false' if accounting is disabled in configs.
> 
> Signed-off-by: Vasily Averin <vvs@...nvz.org>
> Acked-by: Shakeel Butt <shakeelb@...gle.com>
> Acked-by: Roman Gushchin <roman.gushchin@...ux.dev>
> Acked-by: Muchun Song <songmuchun@...edance.com>
> Reviewed-by: Hyeonggon Yoo <42.hyeyoo@...il.com>

Thanks, added to slab/for-5.20/tracing

> 
> ---
> v6:
>  1) subject changed from "tracing:" to "mm/tracing:"
>  2) set flag to 'false' if accounting is disabled in configs

Looks like you forgot the kmem_alloc_node variant, fixed up locally:

--- a/include/trace/events/kmem.h
+++ b/include/trace/events/kmem.h
@@ -94,8 +94,9 @@ DECLARE_EVENT_CLASS(kmem_alloc_node,
                __entry->bytes_alloc    = bytes_alloc;
                __entry->gfp_flags      = (__force unsigned long)gfp_flags;
                __entry->node           = node;
-               __entry->accounted      = (gfp_flags & __GFP_ACCOUNT) ||
-                                         (s && s->flags & SLAB_ACCOUNT);
+               __entry->accounted      = IS_ENABLED(CONFIG_MEMCG_KMEM) ?
+                                         ((gfp_flags & __GFP_ACCOUNT) ||
+                                         (s && s->flags & SLAB_ACCOUNT)) : false;
        ),
 
        TP_printk("call_site=%pS ptr=%p bytes_req=%zu bytes_alloc=%zu gfp_flags=%s node=%d accounted=%s",