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From: Vivek Goyal <vgoyal@redhat.com>
To: Baoquan He <bhe@redhat.com>
Cc: kumagai-atsushi@mxc.nes.nec.co.jp, kexec@lists.infradead.org
Subject: Re: [PATCH v6 8/8] add a new interface to show the memory usage of 1st kernel
Date: Tue, 2 Sep 2014 07:52:30 -0400	[thread overview]
Message-ID: <20140902115230.GA2181@redhat.com> (raw)
In-Reply-To: <1409541340-2719-9-git-send-email-bhe@redhat.com>

On Mon, Sep 01, 2014 at 11:15:40AM +0800, Baoquan He wrote:
> Recently people complained that they don't know how to decide how
> much disk size need be reserved for kdump. E.g there are lots of
> machines with different memory size, if the memory usage information
> of current system can be shown, that can help them to make an estimate
> how much storage space need be reserved.
> 
> In this patch, a new interface is added into makedumpfile. By the
> help of this, people can know the page number of memory in different
> use. The implementation is analyzing the "System Ram" and "kernel text"
> program segment of /proc/kcore excluding the crashkernel range, then
> calculating the page number of different kind per vmcoreinfo.
> 
> The print is like below:
> 
> ~$ ./makedumpfile --mem-usage /proc/kcore
> The kernel version is not supported.
> The makedumpfile operation may be incomplete.
> Excluding unnecessary pages        : [100.0 %] |
> 
> ----------------------------------------------------------------------
^^^^^

Why this line is there?

> TYPE		PAGES			EXCLUDABLE	DESCRIPTION
> ZERO		28823           	yes		Pages filled with zero
> CACHE		197932          	yes		Cache pages
> CACHE_PRIVATE	15862           	yes		Cache pages + private
> USER		30778           	yes		User process pages
> FREE		3671105         	yes		Free pages
> KERN_DATA	105168          	no		Dumpable kernel data
> 
> Total pages on system:	4049668

So this is assuming page size 4K? If some arch is using 16K or 64K,
will it still work correctly.

Thanks
Vivek

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  reply	other threads:[~2014-09-02 11:52 UTC|newest]

Thread overview: 47+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-09-01  3:15 [PATCH v6 0/8] add a new interface to show the memory usage of 1st kernel Baoquan He
2014-09-01  3:15 ` [PATCH v6 1/8] initialize pfn_memhole in get_num_dumpable_cyclic Baoquan He
2014-09-01  3:15 ` [PATCH v6 2/8] functions to get crashkernel memory range Baoquan He
2014-09-01  3:15 ` [PATCH v6 3/8] preparation functions for parsing vmcoreinfo Baoquan He
2014-09-01  3:15 ` [PATCH v6 4/8] set vmcoreinfo for kcore Baoquan He
2014-09-01  3:15 ` [PATCH v6 5/8] prepare the dump loads for kcore analysis Baoquan He
2014-09-01  3:15 ` [PATCH v6 6/8] introduce a function exclude_zero_pages_cyclic() Baoquan He
2014-09-01  3:15 ` [PATCH v6 7/8] implement a function to print the memory usage Baoquan He
2014-09-01  3:15 ` [PATCH v6 8/8] add a new interface to show the memory usage of 1st kernel Baoquan He
2014-09-02 11:52   ` Vivek Goyal [this message]
2014-09-02 13:15     ` Baoquan He
2014-09-02 13:24       ` Baoquan He
2014-09-03  8:18         ` Atsushi Kumagai
2014-09-03  8:21           ` bhe
2014-09-02  6:20 ` [PATCH v6 0/8] " Atsushi Kumagai
2014-09-02  6:38   ` bhe
2014-09-22 15:02 ` Add "--mem-usage" support for s390x Michael Holzheu
2014-09-23  2:40   ` Baoquan He
2014-09-23  2:48     ` Baoquan He
2014-09-23  2:58       ` Baoquan He
2014-09-24 15:19     ` Michael Holzheu
2014-09-25  9:44       ` Baoquan He
2014-09-26  8:10         ` Michael Holzheu
2014-09-26  8:55           ` Baoquan He
2014-09-26  9:14             ` Baoquan He
2014-09-26 11:34             ` Michael Holzheu
2014-09-29  9:04               ` Baoquan He
2014-09-29 13:12                 ` Michael Holzheu
2014-09-29 13:14                 ` [PATCH] makedumpfile: Enable --mem-usage " Michael Holzheu
2014-09-30  9:02                   ` Baoquan He
2014-10-01 16:59                     ` Michael Holzheu
2014-10-09  6:41                       ` Atsushi Kumagai
2014-10-10 12:23                         ` Michael Holzheu
2014-10-14  7:19                           ` Atsushi Kumagai
2014-10-14  7:28                             ` bhe
2014-10-14  7:42                               ` bhe
2014-10-16 12:37                             ` Michael Holzheu
2014-10-23  6:56                               ` Atsushi Kumagai
2014-10-23 10:30                                 ` Michael Holzheu
2014-10-30  1:29                                   ` Atsushi Kumagai
2014-10-30  9:14                                     ` Michael Holzheu
2014-10-31  5:25                                       ` Atsushi Kumagai
2014-10-27  7:57                                 ` bhe
2014-10-27  9:04                                   ` bhe
2014-10-28  4:34                                     ` Atsushi Kumagai
2014-10-28  4:34                                   ` Atsushi Kumagai
2014-10-28  4:46                                     ` bhe

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