1. 29 9月, 2011 1 次提交
  2. 06 5月, 2011 3 次提交
  3. 05 3月, 2011 1 次提交
  4. 30 11月, 2010 3 次提交
  5. 18 11月, 2010 1 次提交
    • P
      rcu: move TINY_RCU from softirq to kthread · b2c0710c
      Paul E. McKenney 提交于
      If RCU priority boosting is to be meaningful, callback invocation must
      be boosted in addition to preempted RCU readers.  Otherwise, in presence
      of CPU real-time threads, the grace period ends, but the callbacks don't
      get invoked.  If the callbacks don't get invoked, the associated memory
      doesn't get freed, so the system is still subject to OOM.
      
      But it is not reasonable to priority-boost RCU_SOFTIRQ, so this commit
      moves the callback invocations to a kthread, which can be boosted easily.
      Signed-off-by: NPaul E. McKenney <paul.mckenney@linaro.org>
      Signed-off-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com>
      b2c0710c
  6. 28 8月, 2010 1 次提交
  7. 21 8月, 2010 1 次提交
  8. 20 8月, 2010 1 次提交
    • P
      rcu: Add a TINY_PREEMPT_RCU · a57eb940
      Paul E. McKenney 提交于
      Implement a small-memory-footprint uniprocessor-only implementation of
      preemptible RCU.  This implementation uses but a single blocked-tasks
      list rather than the combinatorial number used per leaf rcu_node by
      TREE_PREEMPT_RCU, which reduces memory consumption and greatly simplifies
      processing.  This version also takes advantage of uniprocessor execution
      to accelerate grace periods in the case where there are no readers.
      
      The general design is otherwise broadly similar to that of TREE_PREEMPT_RCU.
      
      This implementation is a step towards having RCU implementation driven
      off of the SMP and PREEMPT kernel configuration variables, which can
      happen once this implementation has accumulated sufficient experience.
      
      Removed ACCESS_ONCE() from __rcu_read_unlock() and added barrier() as
      suggested by Steve Rostedt in order to avoid the compiler-reordering
      issue noted by Mathieu Desnoyers (http://lkml.org/lkml/2010/8/16/183).
      
      As can be seen below, CONFIG_TINY_PREEMPT_RCU represents almost 5Kbyte
      savings compared to CONFIG_TREE_PREEMPT_RCU.  Of course, for non-real-time
      workloads, CONFIG_TINY_RCU is even better.
      
      	CONFIG_TREE_PREEMPT_RCU
      
      	   text	   data	    bss	    dec	   filename
      	     13	      0	      0	     13	   kernel/rcupdate.o
      	   6170	    825	     28	   7023	   kernel/rcutree.o
      				   ----
      				   7026    Total
      
      	CONFIG_TINY_PREEMPT_RCU
      
      	   text	   data	    bss	    dec	   filename
      	     13	      0	      0	     13	   kernel/rcupdate.o
      	   2081	     81	      8	   2170	   kernel/rcutiny.o
      				   ----
      				   2183    Total
      
      	CONFIG_TINY_RCU (non-preemptible)
      
      	   text	   data	    bss	    dec	   filename
      	     13	      0	      0	     13	   kernel/rcupdate.o
      	    719	     25	      0	    744	   kernel/rcutiny.o
      				    ---
      				    757    Total
      Requested-by: NLoïc Minier <loic.minier@canonical.com>
      Signed-off-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com>
      a57eb940
  9. 11 5月, 2010 1 次提交
  10. 27 8月, 2009 1 次提交
    • M
      x86: Instruction decoder API · eb13296c
      Masami Hiramatsu 提交于
      Add x86 instruction decoder to arch-specific libraries. This decoder
      can decode x86 instructions used in kernel into prefix, opcode, modrm,
      sib, displacement and immediates. This can also show the length of
      instructions.
      
      This version introduces instruction attributes for decoding
      instructions.
      The instruction attribute tables are generated from the opcode map file
      (x86-opcode-map.txt) by the generator script(gen-insn-attr-x86.awk).
      
      Currently, the opcode maps are based on opcode maps in Intel(R) 64 and
      IA-32 Architectures Software Developers Manual Vol.2: Appendix.A,
      and consist of below two types of opcode tables.
      
      1-byte/2-bytes/3-bytes opcodes, which has 256 elements, are
      written as below;
      
       Table: table-name
       Referrer: escaped-name
       opcode: mnemonic|GrpXXX [operand1[,operand2...]] [(extra1)[,(extra2)...] [| 2nd-mnemonic ...]
        (or)
       opcode: escape # escaped-name
       EndTable
      
      Group opcodes, which has 8 elements, are written as below;
      
       GrpTable: GrpXXX
       reg:  mnemonic [operand1[,operand2...]] [(extra1)[,(extra2)...] [| 2nd-mnemonic ...]
       EndTable
      
      These opcode maps include a few SSE and FP opcodes (for setup), because
      those opcodes are used in the kernel.
      Signed-off-by: NMasami Hiramatsu <mhiramat@redhat.com>
      Signed-off-by: NJim Keniston <jkenisto@us.ibm.com>
      Acked-by: NH. Peter Anvin <hpa@zytor.com>
      Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
      Cc: Avi Kivity <avi@redhat.com>
      Cc: Andi Kleen <ak@linux.intel.com>
      Cc: Christoph Hellwig <hch@infradead.org>
      Cc: Frank Ch. Eigler <fche@redhat.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Jason Baron <jbaron@redhat.com>
      Cc: K.Prasad <prasad@linux.vnet.ibm.com>
      Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
      Cc: Li Zefan <lizf@cn.fujitsu.com>
      Cc: Przemysław Pawełczyk <przemyslaw@pawelczyk.it>
      Cc: Roland McGrath <roland@redhat.com>
      Cc: Sam Ravnborg <sam@ravnborg.org>
      Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: Tom Zanussi <tzanussi@gmail.com>
      Cc: Vegard Nossum <vegard.nossum@gmail.com>
      LKML-Reference: <20090813203413.31965.49709.stgit@localhost.localdomain>
      Signed-off-by: NFrederic Weisbecker <fweisbec@gmail.com>
      eb13296c
  11. 28 11月, 2008 1 次提交
    • N
      [ARM] remove a common set of __virt_to_bus definitions · b5ee9002
      Nicolas Pitre 提交于
      Let's provide an overridable default instead of having every machine
      class define __virt_to_bus and __bus_to_virt to the same thing.  What
      most platforms are using is bus_addr == phys_addr so such is the default.
      
      One exception is ebsa110 which has no DMA what so ever, so the actual
      definition is not important except only for proper compilation.  Also
      added a comment about the special footbridge bus translation.
      
      Let's also remove comments alluding to set_dma_addr which is not
      (and should not) be commonly used.
      Signed-off-by: NNicolas Pitre <nico@marvell.com>
      Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
      b5ee9002
  12. 07 8月, 2008 2 次提交
  13. 08 2月, 2007 1 次提交
  14. 29 6月, 2006 1 次提交
  15. 21 6月, 2006 1 次提交
  16. 10 1月, 2006 1 次提交
  17. 30 10月, 2005 1 次提交
  18. 17 4月, 2005 1 次提交
    • L
      Linux-2.6.12-rc2 · 1da177e4
      Linus Torvalds 提交于
      Initial git repository build. I'm not bothering with the full history,
      even though we have it. We can create a separate "historical" git
      archive of that later if we want to, and in the meantime it's about
      3.2GB when imported into git - space that would just make the early
      git days unnecessarily complicated, when we don't have a lot of good
      infrastructure for it.
      
      Let it rip!
      1da177e4