Kernel 3.0 has ![/!\](/moin_static199/memodump/img/alert.png "/!\"){kind=small}
NOT been released
1. Prominent features (the cool stuff)
== ==
2. Driver and architecture-specific changes
All the driver and architecture-specific changes can be found in the [http://kernelnewbies.org/Linux_3.0_DriverArch Linux_3.0_DriverArch page]
3. Process scheduler
Increase SCHED_LOAD_SCALE resolution: With this extra resolution, the scheduler can handle deeper cgroup hiearchies and do better shares distribution and load load balancing on larger systems (especially for low weight task groups) [http://git.kernel.org/linus/1399fa7807a1a5998bbf147e80668e9950661dfa (commit)], [http://git.kernel.org/linus/c8b281161dfa4bb5d5be63fb036ce19347b88c63 (commit)]
Move the second half of ttwu() to the remote cpu: avoids having to take rq->lock and doing the task enqueue remotely, saving lots on cacheline transfers. A semaphore benchmark goes from 647278 worker burns per second to 816715 [http://git.kernel.org/linus/317f394160e9beb97d19a84c39b7e5eb3d7815a8 (commit)]
Next buddy hint on sleep and preempt path: a worst-case benchmark consisting of 2 tbench client processes with 2 threads each running on a single CPU changed from 105.84 MB/sec to 112.42 MB/sec [http://git.kernel.org/linus/2f36825b176f67e5c5228aa33d828bc39718811f (commit)]
4. Memory management
Make mmu_gather preempemtible [http://git.kernel.org/linus/d16dfc550f5326a4000f3322582a7c05dec91d7a (commit)]
Batch activate_page() calls to reduce zone->lru_lock contention [http://git.kernel.org/linus/eb709b0d062efd653a61183af8e27b2711c3cf5c (commit)]
tmpfs: implement generic xattr support [http://git.kernel.org/linus/b09e0fa4b4ea66266058eead43350bd7d55fec67 (commit)]
- Memory cgroup controller:
Add memory.numastat api for numa statistics [http://git.kernel.org/linus/406eb0c9ba765eb066406fd5ce9d5e2b169a4d5a (commit)]
Add the pagefault count into memcg stats [http://git.kernel.org/linus/456f998ec817ebfa254464be4f089542fa390645 (commit)]
Reclaim memory from nodes in round-robin order [http://git.kernel.org/linus/889976dbcb1218119fdd950fb7819084e37d7d37 (commit)]
Remove the deprecated noswapaccount kernel parameter [http://git.kernel.org/linus/a2c8990aed5ab000491732b07c8c4465d1b389b8 (commit)]
5. VFS
Cache xattr security drop check for write: Some recent benchmarking on btrfs showed that a major scaling bottleneck on large systems on btrfs is currently the xattr lookup on every write, which causes an additional tree walk, hitting some per file system locks and quite bad scalability. This is also a problem in ext4, where it hits the global mbcache lock. Caching this check solves the problem [http://git.kernel.org/linus/69b4573296469fd3f70cf7044693074980517067 (commit)]
6. Block
Submit discard bio in batches in blkdev_issue_discard() - makes discarding data faster [http://git.kernel.org/linus/5dba3089ed03f84b84c6c739df8330112f04a15d (commit)]
DM
7. Networking
Allow setting the network namespace by fd [http://git.kernel.org/linus/f063052947f770845a6252f7fa24f6f624592a24 (commit)]
- Wireless
Add the ability to advertise possible interface combinations [http://git.kernel.org/linus/7527a782e187d1214a5b3dc2897ce441033bb4ef (commit)]
Add support for scheduled scans [http://git.kernel.org/linus/807f8a8c300435d5483e8d78df9dcdbc27333166 (commit)]
Add userspace authentication flag to mesh setup [http://git.kernel.org/linus/15d5dda623139bbf6165030fc251bbd5798f4130 (commit)]
New notification to discover mesh peer candidates. [http://git.kernel.org/linus/c93b5e717ec47b57abfe0229360bc11e77520984 (commit)]
Allow ethtool to set interface in loopback mode. [http://git.kernel.org/linus/eed2a12f1ed9aabf0676f4d0db34aad51976c5c6 (commit)]
Allow no-cache copy from user on transmit [http://git.kernel.org/linus/c6e1a0d12ca7b4f22c58e55a16beacfb7d3d8462 (commit)]
ipset: SCTP, UDPLITE support added [http://git.kernel.org/linus/91eb7c08c6cb3b8eeba1c61f5753c56dcb77f018 (commit)]
sctp: implement socket option SCTP_GET_ASSOC_ID_LIST [http://git.kernel.org/linus/209ba424c2c6e5ff4dd0ff79bb23659aa6048eac (commit)], implement event notification SCTP_SENDER_DRY_EVENT [http://git.kernel.org/linus/e1cdd553d482ceb083fac5e544e8702fccefbfd6 (commit)]
bridge: allow creating bridge devices with netlink [http://git.kernel.org/linus/bb900b27a2f49b37bc38c08e656ea13048fee13b (commit)], allow creating/deleting fdb entries via netlink [http://git.kernel.org/linus/36fd2b63e3b4336744cf3f6a6c9543ecbec334a7 (commit)]
batman-adv: multi vlan support for bridge loop detection [http://git.kernel.org/linus/61906ae86d8989e5bd3bc1f51b2fb8d32ffde2c5 (commit)]
pkt_sched: QFQ - quick fair queue scheduler [http://git.kernel.org/linus/0545a3037773512d3448557ba048cebb73b3e4af (commit)]
RDMA: Add netlink infrastructure that allows for registration of RDMA clients [http://git.kernel.org/linus/b2cbae2c248776d81cc265ff7d48405b6a4cc463 (commit)]
8. File systems
CIFS
Add support for mounting Windows 2008 DFS shares [http://git.kernel.org/linus/c1508ca23653245266e2e3ab69a8dad464f7a569 (commit)]
Convert cifs_writepages to use async writes [http://git.kernel.org/linus/c3d17b63e5eafcaf2678c11de801c189468631c8 (commit)], [http://git.kernel.org/linus/c28c89fc43e3f81436efc4748837534d4d46f90c (commit)]
Add rwpidforward mount option that enables a mode when CIFS forwards pid of a process who opened a file to any read and write operation [http://git.kernel.org/linus/d4ffff1fa9695c5b5c0bf337e208d8833b88ff2d (commit)]
OCFS2
SSD trimming support [http://git.kernel.org/linus/55e67872b67ebd30d1326067cdba53a622ab497d (commit)], [http://git.kernel.org/linus/e80de36d8dbff216a384e9204e54d59deeadf344 (commit)]
Support for moving extents [http://git.kernel.org/linus/028ba5df63fa9fc18045bc1e9b48cdd43727e1c5 (commit)], [http://git.kernel.org/linus/220ebc4334326bc23e4c4c3f076dc5a58ec293f6 (commit)]
NILFS2
Implement resize ioctl [http://git.kernel.org/linus/4e33f9eab07e985282fece4121066c2db1d332ed (commit)]
XFS
Add online discard support [http://git.kernel.org/linus/e84661aa84e2e003738563f65155d4f12dc474e7 (commit)]
9. Crypto
caam - Add support for the Freescale SEC4/CAAM [http://git.kernel.org/linus/8e8ec596e6c0144e2dd500a57ee23dde9684df46 (commit)]
padlock - Add SHA-1/256 module for VIA Nano [http://git.kernel.org/linus/0475add3c27a43a6599fe6338f8fffe919a13547 (commit)]
s390: add System z hardware support for CTR mode [http://git.kernel.org/linus/0200f3ecc19660bebeabbcbaf212957fcf1dbf8f (commit)], add System z hardware support for GHASH [http://git.kernel.org/linus/df1309ce955a490eac6697a41159b43e24d35995 (commit)], add System z hardware support for XTS mode [http://git.kernel.org/linus/99d97222150a24e6096805530e141af94183b9a1 (commit)]
s5p-sss - add S5PV210 advanced crypto engine support [http://git.kernel.org/linus/a49e490c7a8a5c6c9474b1936ad8048f3e4440fc (commit)]
10. Virtualization
User Mode Linux: add earlyprintk support [http://git.kernel.org/linus/d634f194d4e2e58d57927c812aca097e67a2287d (commit)], add ucast ethernet transport [http://git.kernel.org/linus/4ff4d8d342fe25c4d1106fb0ffdd310a43d0ace0 (commit)]
11. Security
Allow the application of capability limits to usermode helpers [http://git.kernel.org/linus/17f60a7da150fdd0cfb9756f86a262daa72c835f (commit)]
- SELinux
add /sys/fs/selinux mount point to put selinuxfs [http://git.kernel.org/linus/7a627e3b9a2bd0f06945bbe64bcf403e788ecf6e (commit)]
Make selinux cache VFS RCU walks safe (improves VFS performance) [http://git.kernel.org/linus/0dc1ba24f7fff659725eecbba2c9ad679a0954cd (commit)]
12. Tracing/profiling
perf stat: Add -d -d and -d -d -d options to show more CPU events [http://git.kernel.org/linus/c6264deff7ea6125492b442edad885e5429679af (commit)], [http://git.kernel.org/linus/2cba3ffb9a9db3874304a1739002d053d53c738b (commit)]
perf stat: Add --sync/-S option [http://git.kernel.org/linus/f9cef0a90c4e7637f1ec98474a1a099aec45eb65 (commit)]
13. Various core changes
rcu: priority boosting for TREE_PREEMPT_RCU [http://git.kernel.org/linus/27f4d28057adf98750cf863c40baefb12f5b6d21 (commit)]
ulimit: raise default hard ulimit on number of files to 4096 [http://git.kernel.org/linus/0ac1ee0bfec2a4ad118f907ce586d0dfd8db7641 (commit)]
- cgroups
remove the Namespace cgroup subsystem. It has been replaced by a compatibility flag 'clone_children', where a newly created cgroup will copy the parent cgroup values. The userspace has to manually create a cgroup and add a task to the 'tasks' file [http://git.kernel.org/linus/a77aea92010acf54ad785047234418d5d68772e2 (commit)]
Make 'procs' file writable [http://git.kernel.org/linus/74a1166dfe1135dcc168d35fa5261aa7e087011b (commit)]
kbuild: implement several W= levels [http://git.kernel.org/linus/28bc20dccadc610c56e27255aeef2938141a0cd3 (commit)]
PM/Hibernate: Add sysfs knob to control size of memory for drivers [http://git.kernel.org/linus/ddeb648708108091a641adad0a438ec4fd8bf190 (commit)]
posix-timers: RCU conversion [http://git.kernel.org/linus/8af088710d1eb3c980e0ef3779c8d47f3f217b48 (commit)]
coredump: add support for exe_file in core name [http://git.kernel.org/linus/57cc083ad9e1bfeeb4a0ee831e7bb008c8865bf0 (commit)]