list of all subsystems (swap space)

list of all subsystems (swap space)

[inventsekar]

Hi All,

1. so I tried to find out which subsystem the swap space comes under..
when I googled for list of subsystems Linux architecture, no luck.
Between, I found out that kernel map (
http://www.makelinux.net/kernel_map/ ), which gives me kind of
subsystems/modules.

Is there any documentation/links for list of subsystems on Linux?!?!

2. it looks like swap space itself a separate subsystem/module.
I thought to subscribe to some lkml dl for swap, but I am not finding any
DL at all. Please suggest.


Best regards
Sekar


On Jan 15, 2018 11:52 PM, "inventsekar" <inventsekar@gmail.com> wrote:

Hi All,
I have been reading about swap space and got  these questions...

1. Btrfs was the only one fs which got this below issue or any other fs
also?
2. The other way around - is there any FS which is best suitable (best
performance) for swap file?
2. Is this issue still there or the wiki isn't updated?

*https://wiki.archlinux.org/index.php/swap
<https://wiki.archlinux.org/index.php/swap>*
*Warning:* Btrfs <https://wiki.archlinux.org/index.php/Btrfs> does not
support swap files. Failure to heed this warning may result in file system
corruption. While a swap file may be used on Btrfs when mounted through a
loop device, this will result in severely degraded swap performance.

Any suggestions, links, documentations please.

Best regards
Sekar
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list of all subsystems (swap space)

[inventsekar]

Ohk, I did some more search and found this... sharing for newbies like me.

> The kernel source tree...
>
> Even the just the modules directory reflects some of that.
>
> ls /lib64/modules/2.6.27-14-generic/kernel/
> arch  crypto  drivers  fs  lib  net  sound  ubuntu
>
> ls /lib64/modules/2.6.27-14-generic/kernel/drivers/
> acpi  auxdisplay  cdrom    crypto  edac      gpu    i2c         input
> md       mfd   mtd      pci     rtc     spi        uio    virtio
> ata   block       char     dca     firmware  hid    ieee1394    isdn
> media    misc  net      pcmcia  scsi    ssb        usb    w1
> atm   bluetooth   cpufreq  dma     gpio      hwmon  infiniband  leds
> message  mmc   parport  power   serial  telephony  video  watchdog

On Jan 19, 2018 11:34 PM, "inventsekar" <inventsekar@gmail.com> wrote:

>
> Hi All,
>
> 1. so I tried to find out which subsystem the swap space comes under..
> when I googled for list of subsystems Linux architecture, no luck.
> Between, I found out that kernel map (   http://www.makelinux.net/
> kernel_map/ ), which gives me kind of subsystems/modules.
>
> Is there any documentation/links for list of subsystems on Linux?!?!
>
> 2. it looks like swap space itself a separate subsystem/module.
> I thought to subscribe to some lkml dl for swap, but I am not finding any
> DL at all. Please suggest.
>
>
> Best regards
> Sekar
>
>
> On Jan 15, 2018 11:52 PM, "inventsekar" <inventsekar@gmail.com> wrote:
>
> Hi All,
> I have been reading about swap space and got  these questions...
>
> 1. Btrfs was the only one fs which got this below issue or any other fs
> also?
> 2. The other way around - is there any FS which is best suitable (best
> performance) for swap file?
> 2. Is this issue still there or the wiki isn't updated?
>
> *https://wiki.archlinux.org/index.php/swap
> <https://wiki.archlinux.org/index.php/swap>*
> *Warning:* Btrfs <https://wiki.archlinux.org/index.php/Btrfs> does not
> support swap files. Failure to heed this warning may result in file system
> corruption. While a swap file may be used on Btrfs when mounted through a
> loop device, this will result in severely degraded swap performance.
>
> Any suggestions, links, documentations please.
>
> Best regards
> Sekar
>
>
>
>
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list of all subsystems (swap space)

[valdis.kletnieks at vt.edu]

On Fri, 19 Jan 2018 21:04:32 +0530, inventsekar said:

> 1. so I tried to find out which subsystem the swap space comes under..

There's nothing for swap in particular.  The decision of what pages to move out
of memory is in the code under mm/ (memory management). The actual  I/O
to/from a swap area depends on what the backing store is - a disk partition, a
file on a filesystem, an NFS mount, or whatever - the I/O gets handled by
whatever drives any other I/O for that target.

MAINTAINERS tells us:

MEMORY MANAGEMENT
L:      linux-mm at kvack.org
W:      http://www.linux-mm.org
S:      Maintained
F:      include/linux/mm.h
F:      include/linux/gfp.h
F:      include/linux/mmzone.h
F:      include/linux/memory_hotplug.h
F:      include/linux/vmalloc.h
F:      mm/

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