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43 <h2>What's new in the Linux kernel</h2>
48 <div class="presentation">
51 <h1>What's new in the Linux kernel</h1>
52 <object data="tux-debian.svg" width="35%" align="right"></object>
53 <h3>Ben Hutchings</h3>
57 <h1>Ben Hutchings</h1>
60 Professional software engineer by day, Debian developer by night
63 Regular Linux contributor in both roles since 2008
66 Maintaining a net driver in my day job, plus core networking
67 and PCI code as necessary
70 Debian kernel team member, now doing most of the unstable
71 maintenance aside from ports
74 Maintaining Linux 3.2.<var>y</var> stable update series on
83 <h1>Linux releases early and often</h1>
84 <ul class="incremental">
86 Linux is released about 5 times a year (plus stable updates
90 For 'wheezy' we chose to freeze with Linux 3.2, which was
91 getting pretty old by the time of release
94 Good news: we have lots of new kernel features in testing/unstable
97 Bad news: some of them won't really work without new userland
103 <h1>Team device driver [3.3]</h1>
104 <ul class="incremental">
106 Alternative to the bonding driver - simpler, modular, high-level
107 control deferred to userland
110 Basic configuration can be done with <tt>ip</tt>, but it really
111 needs new tools - <tt>teamd</tt>, <tt>teamnl</tt>, etc.
114 Want to make it work? See
115 <a href="http://bugs.debian.org/695850">http://bugs.debian.org/695850</a>
121 <h1>Transcendent memory [3.0-3.5]</h1>
122 <ul class="incremental">
124 Abstract storage for memory pages, expected to be slower than
125 regular memory but faster than disk
128 Can provide a second layer of page cache (cleancache and frontswap)
131 Pages stored by hypervisor (Xen), compressed local memory
132 (zcache) or cluster of machines (RAMster)
135 Not yet enabled in Debian kernels, and needs some thought about
139 Want to make it work? See
140 <a href="https://lwn.net/Articles/454795/">https://lwn.net/Articles/454795/</a>
141 and mail debian-kernel
147 <h1>New KMS drivers [3.3-3.10]</h1>
148 <ul class="incremental">
150 DRM/KMS drivers added for old, new and virtual hardware -
151 AST, DisplayLink, Hyper-V, Matrox G200, QEMU Cirrus
154 Should be more robust than purely user-mode drivers, and
155 compatible with Secure Boot
158 Current X drivers don't work with these, so the kernel drivers
162 Want to make it work? Join the X Strike Force and package the
169 <h1>Module signing [3.7]</h1>
170 <ul class="incremental">
172 Kernel modules can be signed at build time, and the kernel
173 configured to refuse loading unsigned modules
176 Necessary but not sufficient to implement Secure Boot -
177 we would also need signed kernel images and some other
178 restrictions when booted in this mode
181 Want to make Secure Boot work? Come to the meeting on Tuesday
187 <h1>More support for discard</h1>
188 <ul class="incremental">
190 Flash devices (and thin-provisioned SANs) can be more efficient
191 if the filesystem 'discards' unused disk space
194 Requires support in hardware, driver, filesystem and any layered
195 device drivers - e.g. LVM, RAID (added in 3.7)
198 Must be explicitly enabled, but d-i doesn't do this by default
201 Want to make it work?
202 See <a href="http://bugs.debian.org/690977">http://bugs.debian.org/690977</a>
208 <h1>User namespaces [3.7]</h1>
209 <ul class="incremental">
211 One of the last missing pieces for OpenVZ-like containers
214 Each user namespace has its own <tt>root</tt> user with
215 privileges over the users and processes in that namespace - but
219 Currently somewhat experimental, and requires filesystem
220 changes which haven't been done for NFS or XFS
223 Want to make it work? This needs upstream work to make those
224 filesystems compatible
237 Linux 'Tux' logo © Larry Ewing, Simon Budig.
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242 <li>Modified by Ben to add Debian open-ND logo</li>
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