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[NTOSKRNL]

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- Tweak the balancer to prevent an excessive buildup of user pages while cache is paged out completely each run
- Bugcheck if we've trimmed everything as much as possibly but we are still in need of pages

svn path=/trunk/; revision=54771
This commit is contained in:
Cameron Gutman 2011-12-28 01:18:35 +00:00
parent f8e647e8a2
commit 4cf336fa2a
1 changed files with 45 additions and 14 deletions
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59
reactos/ntoskrnl/mm/balance.c
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@ -132,17 +132,20 @@ MmReleasePageMemoryConsumer(ULONG Consumer, PFN_NUMBER Page)
return(STATUS_SUCCESS);
}
VOID
ULONG
NTAPI
MiTrimMemoryConsumer(ULONG Consumer)
MiTrimMemoryConsumer(ULONG Consumer, ULONG InitialTarget)
{
LONG Target = 0;
LONG Target = InitialTarget;
ULONG NrFreedPages = 0;
NTSTATUS Status;
/* Make sure we can trim this consumer */
if (!MiMemoryConsumers[Consumer].Trim)
return;
{
/* Return the unmodified initial target */
return InitialTarget;
}
if (MiMemoryConsumers[Consumer].PagesUsed > MiMemoryConsumers[Consumer].PagesTarget)
{
@ -157,8 +160,12 @@ MiTrimMemoryConsumer(ULONG Consumer)
if (Target)
{
/* Swap at least MiMinimumPagesPerRun */
Target = max(Target, MiMinimumPagesPerRun);
if (!InitialTarget)
{
/* If there was no initial target,
* swap at least MiMinimumPagesPerRun */
Target = max(Target, MiMinimumPagesPerRun);
}
/* Now swap the pages out */
Status = MiMemoryConsumers[Consumer].Trim(Target, 0, &NrFreedPages);
@ -169,6 +176,20 @@ MiTrimMemoryConsumer(ULONG Consumer)
{
KeBugCheck(MEMORY_MANAGEMENT);
}
/* Update the target */
if (NrFreedPages < Target)
Target -= NrFreedPages;
else
Target = 0;
/* Return the remaining pages needed to meet the target */
return Target;
}
else
{
/* Initial target is zero and we don't have anything else to add */
return 0;
}
}
@ -348,16 +369,26 @@ MiBalancerThread(PVOID Unused)
if (Status == STATUS_WAIT_0 || Status == STATUS_WAIT_1)
{
for (i = 0; i < MC_MAXIMUM; i++)
{
MiTrimMemoryConsumer(i);
}
ULONG InitialTarget = 0;
if (MmAvailablePages < MiMinimumAvailablePages)
do
{
/* This is really bad... */
DPRINT1("Balancer failed to resolve low memory condition! Complete memory exhaustion is imminent!\n");
}
ULONG OldTarget = InitialTarget;
/* Trim each consumer */
for (i = 0; i < MC_MAXIMUM; i++)
{
InitialTarget = MiTrimMemoryConsumer(i, InitialTarget);
}
/* No pages left to swap! */
if (InitialTarget != 0 &&
InitialTarget == OldTarget)
{
/* Game over */
KeBugCheck(NO_PAGES_AVAILABLE);
}
} while (InitialTarget != 0);
}
else
{