From: "Ulrich Windl" <Ulrich.Windl@rz.uni-regensburg.de>
To: "linux-mm@kvack.org" <linux-mm@kvack.org>
Subject: Improve documentation request for /proc/meminfo (proc.txt)
Date: Wed, 03 May 2017 13:32:38 +0200 [thread overview]
Message-ID: <5909BFD6020000A100025CBF@gwsmtp1.uni-regensburg.de> (raw)
In-Reply-To: <5909BFD6020000A100025CBF@gwsmtp1.uni-regensburg.de>
Hi!
Reading /usr/src/linux/Documentation/filesystems/proc.txt leaves some questions open. For example some values are break-downs of others. I'd like to see documentation on how these relate. For example (3.0.101):
MemTotal: 132156332 kB
MemFree: 22448480 kB
Buffers: 1484072 kB
Cached: 81252832 kB
SwapCached: 0 kB
Active: 24216920 kB
Inactive: 65789500 kB
Active(anon): 20268724 kB
Inactive(anon): 4617808 kB
Active(file): 3948196 kB
Inactive(file): 61171692 kB
Unevictable: 48840 kB
Mlocked: 30444 kB
SwapTotal: 20964788 kB
SwapFree: 20964788 kB
Dirty: 496 kB
Writeback: 0 kB
AnonPages: 7317972 kB
Mapped: 15927688 kB
Shmem: 17602008 kB
Slab: 1162160 kB
SReclaimable: 907496 kB
SUnreclaim: 254664 kB
KernelStack: 8864 kB
PageTables: 1361780 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 79158152 kB
Committed_AS: 66056192 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 305164 kB
VmallocChunk: 34292267888 kB
HardwareCorrupted: 0 kB
AnonHugePages: 4997120 kB
HugePages_Total: 7700
HugePages_Free: 62
HugePages_Rsvd: 44
HugePages_Surp: 0
Hugepagesize: 2048 kB
DirectMap4k: 301296 kB
DirectMap2M: 19611648 kB
DirectMap1G: 114294784 kB
Which numbers sum up to MemTotal? It seems Active(anon) + Active(file) == Active (and similar for inactive).
What is the relation between Unevictable and Mlocked? Is "Unevictable >= Mlocked" all the time?
It would give some insight how things work if you document the relations between some of these numbers.
(I'm hunting for a condition for very bad disk response times, suspecting some memory pressure. I suspect too many dirty pages for some reason...)
Regards,
Ulrich
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parent reply other threads:[~2017-05-03 11:32 UTC|newest]
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