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[NTOSKRNL]

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- Fix a potential infinite loop in MmTrimUserMemory if we can't page out enough pages to meet the balancer's target

svn path=/trunk/; revision=54534
This commit is contained in:
Cameron Gutman 2011-11-29 08:13:56 +00:00
parent f6817e04bc
commit 62e97bd800
1 changed files with 11 additions and 6 deletions
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17
reactos/ntoskrnl/mm/balance.c
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@ -164,14 +164,12 @@ MmTrimUserMemory(ULONG Target, ULONG Priority, PULONG NrFreedPages)
PFN_NUMBER CurrentPage; PFN_NUMBER CurrentPage;
PFN_NUMBER NextPage; PFN_NUMBER NextPage;
NTSTATUS Status; NTSTATUS Status;
(*NrFreedPages) = 0; (*NrFreedPages) = 0;
CurrentPage = MmGetLRUFirstUserPage(); CurrentPage = MmGetLRUFirstUserPage();
while (CurrentPage != 0 && Target > 0) while (CurrentPage != 0 && Target > 0)
{ {
NextPage = MmGetLRUNextUserPage(CurrentPage);
Status = MmPageOutPhysicalAddress(CurrentPage); Status = MmPageOutPhysicalAddress(CurrentPage);
if (NT_SUCCESS(Status)) if (NT_SUCCESS(Status))
{ {
@ -179,10 +177,17 @@ MmTrimUserMemory(ULONG Target, ULONG Priority, PULONG NrFreedPages)
Target--; Target--;
(*NrFreedPages)++; (*NrFreedPages)++;
} }
NextPage = MmGetLRUNextUserPage(CurrentPage);
if (NextPage <= CurrentPage)
{
/* We wrapped around, so we're done */
break;
}
CurrentPage = NextPage; CurrentPage = NextPage;
} }
return(STATUS_SUCCESS);
return STATUS_SUCCESS;
} }
VOID VOID