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@@ -4,7 +4,7 @@
-What's new in the Linux kernel - DebConf 2013
+What's new in the Linux kernel - DebConf 2014
@@ -39,7 +39,7 @@
@@ -59,13 +59,13 @@
-
Professional software engineer by day, Debian developer by night
+ (or sometimes the other way round)
-
Regular Linux contributor in both roles since 2008
-
- Maintaining a net driver in my day job, plus core networking
- and PCI code as necessary
+ Working on various drivers and kernel code in my day job
-
Debian kernel team member, now doing most of the unstable
@@ -84,10 +84,15 @@
-
Linux is released about 5 times a year (plus stable updates
every week or two)
+
+ -
+ ...though some features aren't ready to use when they firat
+ appear in a release
+
+
-
- For 'wheezy' we chose to freeze with Linux 3.2, which was
- getting pretty old by the time of release
+ Since my talk last year, Linus has made 6 releases (3.11-3.16)
-
Good news: we have lots of new kernel features in testing/unstable
@@ -99,174 +104,68 @@
-
Team device driver [3.3]
-
- -
- Alternative to the bonding driver - simpler, modular, high-level
- control deferred to userland
-
- -
- Basic configuration can be done with ip, but it really
- needs new tools - teamd, teamnl, etc.
-
- -
- Make it work: see
- http://bugs.debian.org/695850
-
-
-
-
Transcendent memory [3.0-3.5]
+
Recap of last year's features (1)
-
- Abstract storage for memory pages, expected to be slower than
- regular memory but faster than disk
+ Team device driver: userland package (libteam) was uploaded in
+ October
-
- Can provide a second layer of page cache (cleancache and frontswap)
+ Transcendent memory: frontswap, zswap and Xen tmem will be
+ enabled in next kernel upload
-
- Pages stored by hypervisor (Xen), compressed local memory
- (zcache) or cluster of machines (RAMster)
+ New KMS drivers: should all work with current Xorg drivers
-
- Not yet enabled in Debian kernels, and needs some thought about
- configuration
-
- -
- Make it work: see
- https://lwn.net/Articles/454795/
- and send proposal to debian-kernel
+ Module signing: still not enabled, but probably will be if we
+ do Secure Boot
-
New KMS drivers [3.3-3.10]
+
Recap of last year's features (2)
-
- DRM/KMS drivers added for old, new and virtual hardware -
- AST, DisplayLink, Hyper-V, Matrox G200, QEMU Cirrus
+ More support for discard: still not enabled at install time
+ (#690977)
-
- Should be more robust than purely user-mode drivers, and
- compatible with Secure Boot
+ More support for containers: XFS was fixed, and user namespaces
+ have been enabled
-
- Current X drivers don't work with these, so the kernel drivers
- are disabled for now
+ bcache: userland package (bcache-tools) still not quite ready
+ (#708132)
-
- Make it work: join the X Strike Force and package the new X
- drivers
+ ARMv7 multiplatform: d-i works on some platforms but
+ I'm still not sure which. Some progress on GPU drivers, but not
+ in Debian yet.
-
Module signing [3.7]
-
- -
- Kernel modules can be signed at build time, and the kernel
- configured to refuse loading unsigned modules
-
- -
- Necessary but not sufficient to implement Secure Boot -
- we would also need signed kernel images and some other
- restrictions when booted in this mode
-
- -
- Make Secure Boot work: come to the meeting on Tuesday
-
-
-
-
More support for discard
-
- -
- Flash devices (and thin-provisioned SANs) can be more efficient
- if the filesystem 'discards' unused disk space
-
- -
- Requires support in hardware, driver, filesystem and any layered
- device drivers - e.g. LVM, RAID (added in 3.7)
-
- -
- Must be explicitly enabled, but d-i doesn't do this by default
-
- -
- Make it work: fix http://bugs.debian.org/690977
-
-
-
-
More support for containers
-
- -
- Containers are lightweight VMs - run on the same kernel as host,
- but with limited privileges and resources
-
- -
- Previously done by OpenVZ and Linux-VServer; gradually being
- reimplemented upstream
-
- -
- User namespaces (added in 3.7) support the existence of a
- root user inside the container that is unprivileged
- outside the container
-
- -
- Currently somewhat experimental, and requires filesystem
- changes which haven't been done for XFS
-
- -
- Make user namespaces work: send patches to upstream XFS
- developers (this one's hard)
-
-
-
-
bcache [3.10]
-
- -
- Turns a fast block device into a cache for a larger, slower
- device (see also: dm-cache, EnhanceIO)
-
- -
- Needs its own set of userland tools
-
- -
- Make it work:
- see http://bugs.debian.org/708132
- (maybe just needs a sponsor)
-
-
-
-
ARMv7 multiplatform
-
- -
- Until recently, each ARM kernel image could support only a small
- set of different chips
-
+ Unnamed temporary files [3.11]
+
-
- Debian 'armmp' kernel now supports ARMv7 SoCs from Calxeda,
- Freescale and Marvell, and others should be supported soon
+ Open directory with option O_TMPFILE to create an
+ unnamed temporary file on that filesystem
-
- Debian could run on a much larger range of ARM hardware - but we
- need installer and boot loader support to make this easy
+ As with tmpfile(), the file disppears on
+ last close()
-
- Make it work: join the ARM porters and d-i team
+ File can be linked into the filesystem using
+ linkat(..., AT_EMPTY_PATH), allowing for 'atomic'
+ creation of file with complete contents and metadata
-
- Make the GPUs work: join a reverse-engineering project
+ Not supported on all filesystem types, so you will usually need
+ a fallback