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Merge commit 'v2.6.37-rc8' into x86/apic
Conflicts: arch/x86/include/asm/io_apic.h Merge reason: move to a fresh -rc, resolve the conflict. Signed-off-by: Ingo Molnar <mingo@elte.hu>
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What: /proc/<pid>/oom_adj | ||
When: August 2012 | ||
Why: /proc/<pid>/oom_adj allows userspace to influence the oom killer's | ||
badness heuristic used to determine which task to kill when the kernel | ||
is out of memory. | ||
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The badness heuristic has since been rewritten since the introduction of | ||
this tunable such that its meaning is deprecated. The value was | ||
implemented as a bitshift on a score generated by the badness() | ||
function that did not have any precise units of measure. With the | ||
rewrite, the score is given as a proportion of available memory to the | ||
task allocating pages, so using a bitshift which grows the score | ||
exponentially is, thus, impossible to tune with fine granularity. | ||
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A much more powerful interface, /proc/<pid>/oom_score_adj, was | ||
introduced with the oom killer rewrite that allows users to increase or | ||
decrease the badness() score linearly. This interface will replace | ||
/proc/<pid>/oom_adj. | ||
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A warning will be emitted to the kernel log if an application uses this | ||
deprecated interface. After it is printed once, future warnings will be | ||
suppressed until the kernel is rebooted. |
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What: dv1394 (a.k.a. "OHCI-DV I/O support" for FireWire) | ||
Date: May 2010 (scheduled), finally removed in kernel v2.6.37 | ||
Contact: linux1394-devel@lists.sourceforge.net | ||
Description: | ||
/dev/dv1394/* were character device files, one for each FireWire | ||
controller and for NTSC and PAL respectively, from which DV data | ||
could be received by read() or transmitted by write(). A few | ||
ioctl()s allowed limited control. | ||
This special-purpose interface has been superseded by libraw1394 + | ||
libiec61883 which are functionally equivalent, support HDV, and | ||
transparently work on top of the newer firewire kernel drivers. | ||
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Users: | ||
ffmpeg/libavformat (if configured for DV1394) |
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What: raw1394 (a.k.a. "Raw IEEE1394 I/O support" for FireWire) | ||
Date: May 2010 (scheduled), finally removed in kernel v2.6.37 | ||
Contact: linux1394-devel@lists.sourceforge.net | ||
Description: | ||
/dev/raw1394 was a character device file that allowed low-level | ||
access to FireWire buses. Its major drawbacks were its inability | ||
to implement sensible device security policies, and its low level | ||
of abstraction that required userspace clients do duplicate much | ||
of the kernel's ieee1394 core functionality. | ||
Replaced by /dev/fw*, i.e. the <linux/firewire-cdev.h> ABI of | ||
firewire-core. | ||
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Users: | ||
libraw1394 (works with firewire-cdev too, transparent to library ABI | ||
users) |
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What: video1394 (a.k.a. "OHCI-1394 Video support" for FireWire) | ||
Date: May 2010 (scheduled), finally removed in kernel v2.6.37 | ||
Contact: linux1394-devel@lists.sourceforge.net | ||
Description: | ||
/dev/video1394/* were character device files, one for each FireWire | ||
controller, which were used for isochronous I/O. It was added as an | ||
alternative to raw1394's isochronous I/O functionality which had | ||
performance issues in its first generation. Any video1394 user had | ||
to use raw1394 + libraw1394 too because video1394 did not provide | ||
asynchronous I/O for device discovery and configuration. | ||
Replaced by /dev/fw*, i.e. the <linux/firewire-cdev.h> ABI of | ||
firewire-core. | ||
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Users: | ||
libdc1394 (works with firewire-cdev too, transparent to library ABI | ||
users) |
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What: /sys/block/zram<id>/disksize | ||
Date: August 2010 | ||
Contact: Nitin Gupta <ngupta@vflare.org> | ||
Description: | ||
The disksize file is read-write and specifies the disk size | ||
which represents the limit on the *uncompressed* worth of data | ||
that can be stored in this disk. | ||
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What: /sys/block/zram<id>/initstate | ||
Date: August 2010 | ||
Contact: Nitin Gupta <ngupta@vflare.org> | ||
Description: | ||
The disksize file is read-only and shows the initialization | ||
state of the device. | ||
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What: /sys/block/zram<id>/reset | ||
Date: August 2010 | ||
Contact: Nitin Gupta <ngupta@vflare.org> | ||
Description: | ||
The disksize file is write-only and allows resetting the | ||
device. The reset operation frees all the memory assocaited | ||
with this device. | ||
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What: /sys/block/zram<id>/num_reads | ||
Date: August 2010 | ||
Contact: Nitin Gupta <ngupta@vflare.org> | ||
Description: | ||
The num_reads file is read-only and specifies the number of | ||
reads (failed or successful) done on this device. | ||
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What: /sys/block/zram<id>/num_writes | ||
Date: August 2010 | ||
Contact: Nitin Gupta <ngupta@vflare.org> | ||
Description: | ||
The num_writes file is read-only and specifies the number of | ||
writes (failed or successful) done on this device. | ||
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What: /sys/block/zram<id>/invalid_io | ||
Date: August 2010 | ||
Contact: Nitin Gupta <ngupta@vflare.org> | ||
Description: | ||
The invalid_io file is read-only and specifies the number of | ||
non-page-size-aligned I/O requests issued to this device. | ||
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What: /sys/block/zram<id>/notify_free | ||
Date: August 2010 | ||
Contact: Nitin Gupta <ngupta@vflare.org> | ||
Description: | ||
The notify_free file is read-only and specifies the number of | ||
swap slot free notifications received by this device. These | ||
notifications are send to a swap block device when a swap slot | ||
is freed. This statistic is applicable only when this disk is | ||
being used as a swap disk. | ||
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What: /sys/block/zram<id>/discard | ||
Date: August 2010 | ||
Contact: Nitin Gupta <ngupta@vflare.org> | ||
Description: | ||
The discard file is read-only and specifies the number of | ||
discard requests received by this device. These requests | ||
provide information to block device regarding blocks which are | ||
no longer used by filesystem. | ||
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What: /sys/block/zram<id>/zero_pages | ||
Date: August 2010 | ||
Contact: Nitin Gupta <ngupta@vflare.org> | ||
Description: | ||
The zero_pages file is read-only and specifies number of zero | ||
filled pages written to this disk. No memory is allocated for | ||
such pages. | ||
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What: /sys/block/zram<id>/orig_data_size | ||
Date: August 2010 | ||
Contact: Nitin Gupta <ngupta@vflare.org> | ||
Description: | ||
The orig_data_size file is read-only and specifies uncompressed | ||
size of data stored in this disk. This excludes zero-filled | ||
pages (zero_pages) since no memory is allocated for them. | ||
Unit: bytes | ||
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What: /sys/block/zram<id>/compr_data_size | ||
Date: August 2010 | ||
Contact: Nitin Gupta <ngupta@vflare.org> | ||
Description: | ||
The compr_data_size file is read-only and specifies compressed | ||
size of data stored in this disk. So, compression ratio can be | ||
calculated using orig_data_size and this statistic. | ||
Unit: bytes | ||
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What: /sys/block/zram<id>/mem_used_total | ||
Date: August 2010 | ||
Contact: Nitin Gupta <ngupta@vflare.org> | ||
Description: | ||
The mem_used_total file is read-only and specifies the amount | ||
of memory, including allocator fragmentation and metadata | ||
overhead, allocated for this disk. So, allocator space | ||
efficiency can be calculated using compr_data_size and this | ||
statistic. | ||
Unit: bytes |
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What: /sys/bus/rbd/ | ||
Date: November 2010 | ||
Contact: Yehuda Sadeh <yehuda@hq.newdream.net>, | ||
Sage Weil <sage@newdream.net> | ||
Description: | ||
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Being used for adding and removing rbd block devices. | ||
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Usage: <mon ip addr> <options> <pool name> <rbd image name> [snap name] | ||
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$ echo "192.168.0.1 name=admin rbd foo" > /sys/bus/rbd/add | ||
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The snapshot name can be "-" or omitted to map the image read/write. A <dev-id> | ||
will be assigned for any registered block device. If snapshot is used, it will | ||
be mapped read-only. | ||
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Removal of a device: | ||
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$ echo <dev-id> > /sys/bus/rbd/remove | ||
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Entries under /sys/bus/rbd/devices/<dev-id>/ | ||
-------------------------------------------- | ||
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client_id | ||
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The ceph unique client id that was assigned for this specific session. | ||
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major | ||
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The block device major number. | ||
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name | ||
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The name of the rbd image. | ||
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pool | ||
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The pool where this rbd image resides. The pool-name pair is unique | ||
per rados system. | ||
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size | ||
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The size (in bytes) of the mapped block device. | ||
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refresh | ||
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Writing to this file will reread the image header data and set | ||
all relevant datastructures accordingly. | ||
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current_snap | ||
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The current snapshot for which the device is mapped. | ||
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create_snap | ||
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Create a snapshot: | ||
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$ echo <snap-name> > /sys/bus/rbd/devices/<dev-id>/snap_create | ||
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rollback_snap | ||
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Rolls back data to the specified snapshot. This goes over the entire | ||
list of rados blocks and sends a rollback command to each. | ||
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$ echo <snap-name> > /sys/bus/rbd/devices/<dev-id>/snap_rollback | ||
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snap_* | ||
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A directory per each snapshot | ||
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Entries under /sys/bus/rbd/devices/<dev-id>/snap_<snap-name> | ||
------------------------------------------------------------- | ||
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id | ||
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The rados internal snapshot id assigned for this snapshot | ||
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size | ||
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The size of the image when this snapshot was taken. | ||
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What: state | ||
Date: Sep 2010 | ||
KernelVersion: 2.6.37 | ||
Contact: Vernon Mauery <vernux@us.ibm.com> | ||
Description: The state file allows a means by which to change in and | ||
out of Premium Real-Time Mode (PRTM), as well as the | ||
ability to query the current state. | ||
0 => PRTM off | ||
1 => PRTM enabled | ||
Users: The ibm-prtm userspace daemon uses this interface. | ||
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What: version | ||
Date: Sep 2010 | ||
KernelVersion: 2.6.37 | ||
Contact: Vernon Mauery <vernux@us.ibm.com> | ||
Description: The version file provides a means by which to query | ||
the RTL table version that lives in the Extended | ||
BIOS Data Area (EBDA). | ||
Users: The ibm-prtm userspace daemon uses this interface. | ||
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