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[NTOSKRNL] Modified CcCanIWrite to handle Mm throttling limits

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Pierre Schweitzer 2018-02-09 14:22:00 +01:00
parent 6b0cb54fe5
commit 5d93941d31
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1 changed files with 7 additions and 1 deletions
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8
ntoskrnl/cc/copy.c
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@ -697,10 +697,16 @@ CcCanIWrite (
/* So, now allow write if:
* - Not the first try or we have no throttling yet
* AND:
* - We don't execeed threshold!
* - We don't exceed threshold!
* - We don't exceed what Mm can allow us to use
* + If we're above top, that's fine
* + If we're above bottom with limited modified pages, that's fine
* + Otherwise, throttle!
*/
if ((TryContext != FirstTry || IsListEmpty(&CcDeferredWrites)) &&
CcTotalDirtyPages + Pages < CcDirtyPageThreshold &&
(MmAvailablePages > MmThrottleTop ||
(MmModifiedPageListHead.Total < 1000 && MmAvailablePages > MmThrottleBottom)) &&
!PerFileDefer)
{
return TRUE;