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From: Ming Lei <ming.lei@redhat.com>
To: "Ray, Mark C (Global Solutions Engineering (GSE))" <mark.ray@hpe.com>
Cc: Greg KH <gregkh@linuxfoundation.org>,
	Jens Axboe <axboe@kernel.dk>,
	"linux-block@vger.kernel.org" <linux-block@vger.kernel.org>,
	"stable@vger.kernel.org" <stable@vger.kernel.org>
Subject: Re: [PATCH] blk-mq: avoid sysfs buffer overflow by too many CPU cores
Date: Fri, 16 Aug 2019 10:49:35 +0800
Message-ID: <20190816024934.GA27844@ming.t460p> (raw)
In-Reply-To: <AT5PR8401MB05784C37BAF2939B776103FC99AC0@AT5PR8401MB0578.NAMPRD84.PROD.OUTLOOK.COM>

On Thu, Aug 15, 2019 at 11:10:35PM +0000, Ray, Mark C (Global Solutions Engineering (GSE)) wrote:
> Hi Ming,
> 
> In the customer case, the cpu_list file was not needed.   It was just part of a SAP Hana script to collect all the block device data (similar to sosreport).    So they were just dumping everything, and it picks up the mq-related files.  
> 
> I know with IRQs, we have bitmaps/mask, and can represent the list such as "0-27", without listing every CPU.   I'm sure there's lots of options to address this, and getting rid of the cpu_list is one of them.

Indeed, same with several attributes under /sys/devices/system/cpu/,
actually we can use cpumap_print_to_pagebuf() to print the CPUs.

Thanks,
Ming

  reply index

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-15 12:15 Ming Lei
2019-08-15 12:24 ` Greg KH
2019-08-15 12:29   ` Ming Lei
2019-08-15 12:35     ` Greg KH
2019-08-15 12:43       ` Ming Lei
2019-08-15 13:21         ` Greg KH
2019-08-15 23:10         ` Ray, Mark C (Global Solutions Engineering (GSE))
2019-08-16  2:49           ` Ming Lei [this message]
2019-08-16  7:12             ` Greg KH
2019-08-16 14:21               ` Jens Axboe

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