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Date: Mon, 20 Dec 2010 18:12:56 +0100 From: Tejun Heo <tj@...nel.org> To: Martin Steigerwald <Martin@...htvoll.de> CC: linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org, linux-scsi@...r.kernel.org Subject: Re: [regression] 2.6.37-rc5: scsi_eh_11 CPU loop Hello, On 12/20/2010 11:05 AM, Martin Steigerwald wrote: > Hi! > > top - 10:49:07 up 3 days, 14:24, 8 users, load average: 2.31, 2.62, 2.28 > Tasks: 198 total, 2 running, 194 sleeping, 0 stopped, 2 zombie > Cpu(s): 6.8%us, 93.2%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi, 0.0%si, > 0.0%st > Mem: 2073660k total, 1941152k used, 132508k free, 153876k buffers > Swap: 4000180k total, 243452k used, 3756728k free, 676612k cached > > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND > 735 root 20 0 0 0 0 R 85.2 0.0 137:28.94 scsi_eh_11 > > I don't see anything in dmesg. Everything appears to work as normal, > except for the slowness. Which got a bit better upon renicing scsi_eh_11 > to 19 (not knowing whether its really safe, but it works for now). > > Interrupts appear to be within usual range as well: Can you please apply the following patch, trigger the problem and attach the kernel log? diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c index 5e59050..c748b5a 100644 --- a/drivers/ata/libata-eh.c +++ b/drivers/ata/libata-eh.c @@ -888,12 +888,19 @@ void ata_eh_fastdrain_timerfn(unsigned long arg) */ static void ata_eh_set_pending(struct ata_port *ap, int fastdrain) { + static int xxx; int cnt; /* already scheduled? */ if (ap->pflags & ATA_PFLAG_EH_PENDING) return; + if (!(ap->pflags & ATA_PFLAG_LOADING) && xxx < 16) { + ata_port_printk(ap, KERN_WARNING, "XXX ata_eh_set_pending()\n"); + dump_stack(); + xxx++; + } + ap->pflags |= ATA_PFLAG_EH_PENDING; if (!fastdrain) -- tejun -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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