Hi, On Mon, May 15, 2023 at 08:44:30AM +0000, Pratoussy, Martin (GE Vernova) wrote: > Hello, > > We are facing an issue regarding Linux kernel 5.10.153. When we try to > allocate huge amount of memory, we eventually run prematurely out of > memory. The bug has been discovered as follows: although "free" and > "top" commands would show 40 MB of free memory, sending a 32 MB file > through SFTP into RAM cache will lead to an OOM error before finishing > the transfer. > It has been noted that the command "echo 1 > /prox/sys/vm/compact_memory" > leads into the very same behavior of the kernel. Disabling > CONFIG_COMPACTION is surprisingly resolving the allocation issue and we > are trying to understand why. > > You will find below more information about the error we are facing: > > * Architecture: Nios2 > * Total RAM size: 64 MB > * Available RAM size when error occurs: ~17MB > * Error message: "Huh VM_FAULT_OOM leaked out to the #PF handler. Retrying PF" > > Would you have any idea of what is happening? Even without digging into the actual reason for OOM, it makes perfect sense to disable compaction on your system. > You will find attached the .config of our kernel. > > Best regards, > > Martin Pratoussy > Embedded software engineer apprentice - Electronics & High Voltage Digital, Grid Solutions > GE Renewable > M +33 (0)7 82 54 60 81 > www.gegridsolutions.com<http://www.gegridsolutions.com> > 21, Rue Cyprian | 69100 Villeurbanne | France > -- Sincerely yours, Mike.
