Live-lock issues in memory allocator.

    * Debug tool for PageManager.
    * Support PageMgr allocations of non-2^k size.
    * Switch page-allocation to always be in kernel-mode.

    While investigating issue 44511, I noticed two problesm with the
    memory page allocator (PageManager).  First, the allocator did
    not support allocations of pages which were not a power of 2,
    which would result in pages appearing to "leak".  Second, in
    situations where a large allocation was requested and there was
    not a large chunk available, the allocation would enter a
    live-lock condition where coalescing would never occur.

    Switched the PageManager so that all allocations happen in
    kernel space.  This allows us to force memory-release operations
    on the syscall path when we are out of memory and also put in
    place a task_yield call which will allow coalescing to eventually
    occur.  Issue 44523 is suppose to fully resolve any of these
    live-lock paths.

RTC: 44511
Change-Id: Ifefd5d0996ee6914e291c862fac0c7b76980717f
Reviewed-on: http://gfw160.austin.ibm.com:8080/gerrit/1330
Tested-by: Jenkins Server
Reviewed-by: Daniel M. Crowell <dcrowell@us.ibm.com>
Reviewed-by: A. Patrick Williams III <iawillia@us.ibm.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/src/include/kernel/syscalls.H b/src/include/kernel/syscalls.H
index 20cfd4e65..a46fde703 100644
--- a/src/include/kernel/syscalls.H
+++ b/src/include/kernel/syscalls.H
@@ -97,8 +97,8 @@ namespace Systemcalls
            /** mm_set_permission() */
         MM_SET_PERMISSION,
 
-           /** mm_flush_pages() */
-        MM_FLUSH_PAGES,
+           /** mm_alloc_pages() */
+        MM_ALLOC_PAGES,
 
 	SYSCALL_MAX
     };