linux-kernel - Re: [PATCH 19/33] autonuma: memory follows CPU algorithm and task/mm

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Date:	Mon, 15 Oct 2012 10:20:44 +0100
From:	Mel Gorman <mel@....ul.ie>
To:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:	Andrea Arcangeli <aarcange@...hat.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	pzijlstr@...hat.com, mingo@...e.hu, hughd@...gle.com,
	riel@...hat.com, hannes@...xchg.org, dhillf@...il.com,
	drjones@...hat.com, tglx@...utronix.de, pjt@...gle.com,
	cl@...ux.com, suresh.b.siddha@...el.com, efault@....de,
	paulmck@...ux.vnet.ibm.com, laijs@...fujitsu.com,
	Lee.Schermerhorn@...com, alex.shi@...el.com,
	benh@...nel.crashing.org
Subject: Re: [PATCH 19/33] autonuma: memory follows CPU algorithm and
 task/mm_autonuma stats collection

On Mon, Oct 15, 2012 at 01:54:13PM +0530, Srikar Dronamraju wrote:
> * Srikar Dronamraju <srikar@...ux.vnet.ibm.com> [2012-10-13 23:36:18]:
> 
> > > +
> > > +bool numa_hinting_fault(struct page *page, int numpages)
> > > +{
> > > +	bool migrated = false;
> > > +
> > > +	/*
> > > +	 * "current->mm" could be different from the "mm" where the
> > > +	 * NUMA hinting page fault happened, if get_user_pages()
> > > +	 * triggered the fault on some other process "mm". That is ok,
> > > +	 * all we care about is to count the "page_nid" access on the
> > > +	 * current->task_autonuma, even if the page belongs to a
> > > +	 * different "mm".
> > > +	 */
> > > +	WARN_ON_ONCE(!current->mm);
> > 
> > Given the above comment, Do we really need this warn_on?
> > I think I have seen this warning when using autonuma.
> > 
> 
> ------------[ cut here ]------------
> WARNING: at ../mm/autonuma.c:359 numa_hinting_fault+0x60d/0x7c0()
> Hardware name: BladeCenter HS22V -[7871AC1]-
> Modules linked in: ebtable_nat ebtables autofs4 sunrpc cpufreq_ondemand acpi_cpufreq freq_table mperf bridge stp llc iptable_filter ip_tables ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 xt_state nf_conntrack ip6table_filter ip6_tables ipv6 vhost_net macvtap macvlan tun iTCO_wdt iTCO_vendor_support cdc_ether usbnet mii kvm_intel kvm microcode serio_raw lpc_ich mfd_core i2c_i801 i2c_core shpchp ioatdma i7core_edac edac_core bnx2 ixgbe dca mdio sg ext4 mbcache jbd2 sd_mod crc_t10dif mptsas mptscsih mptbase scsi_transport_sas dm_mirror dm_region_hash dm_log dm_mod
> Pid: 116, comm: ksmd Tainted: G      D      3.6.0-autonuma27+ #3

The kernel is tainted "D" which implies that it has already oopsed
before this warning was triggered. What was the other oops?

-- 
Mel Gorman
SUSE Labs
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