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From: Mike Galbraith <efault@gmx.de>
To: lkml <linux-kernel@vger.kernel.org>
Cc: "J. Bruce Fields" <bfields@fieldses.org>,
	Jeff Layton <jlayton@kernel.org>,
	linux-nfs@vger.kernel.org
Subject: NFS: 82ms wakeup latency 4.14-rc4
Date: Mon, 18 Dec 2017 16:17:11 +0100	[thread overview]
Message-ID: <1513610231.7998.13.camel@gmx.de> (raw)

Greetings,

While doing some generic scheduler latency testing, I stumbled onto
$subject.  To reproduce this, I simply nfs mount my box, cd to one of
it's spinning rust buckets, and do bonnie -s <ramsize>.  With nothing
else going on in the box, I've hit > 100ms wakeup latencies.

(nouveau apparently also thinks this is uncool, and whimpers) 

....
kworker/-7421    0.N.. 82893us : nfs_release_request <-nfs_commit_release_pages
kworker/-7421    0.N.. 82893us : nfs_unlock_and_release_request <-nfs_commit_release_pages
kworker/-7421    0.N.. 82893us : nfs_unlock_request <-nfs_unlock_and_release_request
kworker/-7421    0.N.. 82893us : nfs_page_group_destroy <-nfs_commit_release_pages
kworker/-7421    0.N.. 82893us : nfs_page_group_sync_on_bit <-nfs_page_group_destroy
kworker/-7421    0.N.. 82893us : nfs_page_group_lock <-nfs_page_group_sync_on_bit
kworker/-7421    0.N.. 82893us : nfs_page_group_unlock <-nfs_page_group_sync_on_bit
kworker/-7421    0.N.. 82893us : nfs_free_request <-nfs_page_group_destroy
kworker/-7421    0.N.. 82893us : nfs_put_lock_context <-nfs_free_request
kworker/-7421    0.N.. 82893us : put_nfs_open_context <-nfs_free_request
kworker/-7421    0.N.. 82893us : __put_nfs_open_context <-nfs_free_request
kworker/-7421    0.N.. 82894us : kmem_cache_free <-nfs_page_group_destroy
kworker/-7421    0.N.. 82894us : __slab_free <-kmem_cache_free
kworker/-7421    0.N.. 82894us : clear_wb_congested <-nfs_commit_release_pages
kworker/-7421    0.N.. 82894us : nfs_init_cinfo <-nfs_commit_release_pages
kworker/-7421    0.N.. 82894us : nfs_init_cinfo_from_inode <-nfs_commit_release_pages
kworker/-7421    0.N.. 82894us : nfs_commit_end <-nfs_commit_release_pages
kworker/-7421    0.N.. 82894us : nfs_commitdata_release <-rpc_free_task
kworker/-7421    0.N.. 82894us : put_nfs_open_context <-nfs_commitdata_release
kworker/-7421    0.N.. 82894us : __put_nfs_open_context <-nfs_commitdata_release
kworker/-7421    0.N.. 82895us : mempool_free <-rpc_free_task
kworker/-7421    0.N.. 82895us : mempool_free_slab <-rpc_free_task
kworker/-7421    0.N.. 82895us : kmem_cache_free <-rpc_free_task
kworker/-7421    0.N.. 82895us : ___might_sleep <-process_one_work
kworker/-7421    0.N.. 82895us : _cond_resched <-process_one_work
kworker/-7421    0dN.1 82895us : rcu_note_context_switch <-__schedule

             reply	other threads:[~2017-12-18 15:17 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-12-18 15:17 Mike Galbraith [this message]
2017-12-18 15:31 ` NFS: 82ms wakeup latency 4.14-rc4 Mike Galbraith
2017-12-18 16:35   ` J. Bruce Fields
2017-12-18 16:48     ` Mike Galbraith
2017-12-18 17:00     ` Mike Galbraith
2017-12-18 17:17       ` Mike Galbraith
2017-12-18 17:27         ` J. Bruce Fields
2017-12-18 17:47           ` Mike Galbraith
2017-12-18 18:34           ` Mike Galbraith
2017-12-18 17:24       ` Trond Myklebust
2017-12-18 17:26         ` Mike Galbraith
2018-01-02 20:29         ` [patch] fs/nfs: Add a resched point to nfs_commit_release_pages() Mike Galbraith

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