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From: Michal Hocko <mhocko@kernel.org>
To: Shantanu Goel <sgoel01@yahoo.com>
Cc: "linux-mm@kvack.org" <linux-mm@kvack.org>,
	Vladimir Davydov <vdavydov.dev@gmail.com>,
	Johannes Weiner <hannes@cmpxchg.org>
Subject: Re: [PATCH] vmscan: Skip slab scan when LRU size is zero
Date: Wed, 8 Feb 2017 14:37:32 +0100	[thread overview]
Message-ID: <20170208133732.GM5686@dhcp22.suse.cz> (raw)
In-Reply-To: <16b94242-095e-ac71-cb27-a20f2f2c2100@yahoo.com>

On Mon 06-02-17 19:47:49, Shantanu Goel wrote:
[...]
> #                              _-----=> irqs-off
> #                             / _----=> need-resched
> #                            | / _---=> hardirq/softirq
> #                            || / _--=> preempt-depth
> #                            ||| /     delay
> #           TASK-PID   CPU#  ||||    TIMESTAMP  FUNCTION
> #              | |       |   ||||       |         |
[...]
All previous entries are for super_cache_scan so they will not tell us
much about the previous state of scan_shadow_nodes so this output seems
incomplete. Could you also enable mm_shrink_slab_end tracepoint please?

>          kswapd0-93    [005] .... 49736.760169: mm_shrink_slab_start:
> scan_shadow_nodes+0x0/0x50 ffffffff94e6e460: nid: 0 objects to shrink
> 59291940 gfp_flags GFP_KERNEL pgs_scanned 32 lru_pgs 0 cache items 20 delta
> 1280 total_scan 40
-- 
Michal Hocko
SUSE Labs

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      reply	other threads:[~2017-02-08 13:37 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <1837390276.846271.1486216381871.ref@mail.yahoo.com>
2017-02-04 13:53 ` [PATCH] vmscan: Skip slab scan when LRU size is zero Shantanu Goel
2017-02-06  8:30   ` Michal Hocko
2017-02-07  0:47     ` Shantanu Goel
2017-02-08 13:37       ` Michal Hocko [this message]

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