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, 0 insertions, 8 deletions

diff --git a/src/lib/syscall_mm.C b/src/lib/syscall_mm.C
index 006586f81..b539cf05a 100644
--- a/src/lib/syscall_mm.C
+++ b/src/lib/syscall_mm.C
@@ -81,11 +81,3 @@ int mm_set_permission(void* va, uint64_t size, uint64_t access_type)
 {
     return (int64_t)_syscall3(MM_SET_PERMISSION, va, (void*)size,  (void*)access_type);
 }
-
-/**
- * System call to flush pages
- */
-void mm_flush_pages(uint64_t i_sev)
-{
-    _syscall1(MM_FLUSH_PAGES, (void*)i_sev);
-}