litmus-rt.git, branch 2012.2 The LITMUS^RT kernel. New Feature: Arbitrary deadlines. 2012-08-01T06:40:25+00:00 Glenn Elliott gelliott@cs.unc.edu 2012-07-17T00:20:52+00:00 b53c479a0f44b8990ce106622412a3bf54809944 Added support for arbitrary deadlines. Constraint: Relative deadline must be >= exec cost. Use: Set relative deadline in rt_task::rdeadline. Set value to 0 to default to implicit deadlines. Limitations: PFAIR not supported by this patch. PFAIR updated to reject tasks that do not have implicit deadlines. 
Added support for arbitrary deadlines.

Constraint: Relative deadline must be >= exec cost.

Use: Set relative deadline in rt_task::rdeadline. Set value to 0
     to default to implicit deadlines.

Limitations: PFAIR not supported by this patch. PFAIR updated to
     reject tasks that do not have implicit deadlines.
control page: avoid "minor" page faults 2012-07-23T10:05:40+00:00 Bjoern Brandenburg bbb@mpi-sws.org 2012-06-25T13:29:17+00:00 a6d64b9717782170ba27c16b6df8191169d92fad By default, even private writable pages are mapped with the RW bit disabled in the PTE. This causes a "minor" page fault when the page is first written to. To avoid this, make sure that vm_inert_page() uses the proper page protection bits and mark the VMA as VM_IO to keep the rest of the VM code out. 
By default, even private writable pages are mapped
with the RW bit disabled in the PTE. This causes a
"minor" page fault when the page is first written
to. To avoid this, make sure that vm_inert_page()
uses the proper page protection bits and mark the
VMA as VM_IO to keep the rest of the VM code out.
control page: warn on page fault 2012-07-23T10:05:40+00:00 Bjoern Brandenburg bbb@mpi-sws.org 2012-06-25T13:26:06+00:00 c85e6eae1698cecb15d63e112e937f706280c78e Page faults should not happen here. Scream if they do anyway. This is useful when extending the control page. 
Page faults should not happen here.  Scream if they do anyway. This is
useful when extending the control page.
control page: use vm_insert_page() instead of remap_pfn_range() 2012-07-23T10:05:39+00:00 Bjoern Brandenburg bbb@mpi-sws.org 2012-06-25T07:25:25+00:00 d85fc52b409dc4007ab848388c3e096eec85268d vm_insert_page() is the simpler and preferred interface for remapping individual pages and includes additional error checks. It suffices for our purposes, so let's use it instead. 
vm_insert_page() is the simpler and preferred interface for remapping
individual pages and includes additional error checks. It suffices for
our purposes, so let's use it instead.
P-FP: reject tasks with invalid priorities 2012-07-23T09:58:01+00:00 Bjoern Brandenburg bbb@mpi-sws.org 2012-06-26T08:58:22+00:00 b83f375cdcaf08055ff8bff9d76944edca4202dc The existing admission test failed to test for too-low priorities. Use the common macro to accept only valid priorities. 
The existing admission test failed to test for too-low
priorities. Use the common macro to accept only valid
priorities.
P-FP: Clarify meaning of priorities 2012-07-23T09:58:00+00:00 Bjoern Brandenburg bbb@mpi-sws.org 2012-06-26T08:45:31+00:00 c1350f82ee53098f52b712877c3b8e0876952f52 Add a comment to explain how priorities are interpreted, and provide some useful macros for userspace. 
Add a comment to explain how priorities are
interpreted, and provide some useful macros for
userspace.
P-FP: fix build bug if !CONFIG_RELEASE_MASTER 2012-07-23T09:58:00+00:00 Bjoern Brandenburg bbb@mpi-sws.org 2012-06-26T08:02:52+00:00 c2034d8205674daa954ee314f93270f39b90148f Move declaration of 'cpu' out of #ifdef block, it's also needed for CONFIG_LITMUS_LOCKING. 
Move declaration of 'cpu' out of #ifdef block, it's also needed for
CONFIG_LITMUS_LOCKING.
P-FP: make PCP available to userspace 2012-07-23T09:57:59+00:00 Sven Dziadek s9svdzia@stud.uni-saarland.de 2012-04-16T19:18:09+00:00 aced1a8244189e4016b1fdef249b3297c09f626d Prior to that it was only used internally for DPCP 
Prior to that it was only used internally for DPCP
P-FP: port P-FP plugin used in B. Brandenburg's 2012-07-23T09:57:59+00:00 Sven Dziadek s9svdzia@stud.uni-saarland.de 2012-04-16T19:00:33+00:00 16c1fb2d4ac691e941456a084284020c63fce93a dissertation (branch bbb-diss) to current version of litmus This is needed for ongoing projects I took the unchanged code but removed some leftovers of OMLP which is not implemented 
      dissertation (branch bbb-diss) to current
      version of litmus

This is needed for ongoing projects

I took the unchanged code but removed some leftovers
of OMLP which is not implemented
Update to improved x86 Feather-Trace triggers 2012-06-26T09:08:24+00:00 Bjoern Brandenburg bbb@mpi-sws.org 2012-05-30T08:16:32+00:00 4bc55d3b64fdf0af17f4777013a74fbef7f40ced This patch imports recent upstream changes in Feather-Trace that reduce register pressure around Feather-Trace triggers. References: Commits 00713b8 and 225d734 in Feather-Trace. https://github.com/brandenburg/feather-trace/commit/00713b878636867ce07291c588509b38fa5bf152 https://github.com/brandenburg/feather-trace/commit/225d7348a08682cd87f72b127142bdfd6c0c7890 
This patch imports recent upstream changes in Feather-Trace that reduce
register pressure around Feather-Trace triggers.

References: Commits 00713b8 and 225d734 in Feather-Trace.

    https://github.com/brandenburg/feather-trace/commit/00713b878636867ce07291c588509b38fa5bf152
    https://github.com/brandenburg/feather-trace/commit/225d7348a08682cd87f72b127142bdfd6c0c7890