Re: [PATCH 00/16] mm: Introduce MAP_BELOW_HINT

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 8/28/24 13:15, Charlie Jenkins wrote:
> A way to restrict mmap() to return LAM compliant addresses in an entire
> address space also doesn't have to be mutually exclusive with this flag.
> This flag allows for the greatest degree of control from applications.
> I don't believe there is additionally performance saving that could be
> achieved by having this be on a per address space basis.

I agree with you in general.  The MAP_BELOW_HINT _is_ the most flexible.
 But it's also rather complicated.

My _hope_ would be that a per-address-space property could share at
least some infrastructure with what x86/LAM and arm/TBI do to the
address space.  Basically put the restrictions in place for purely
software reasons instead of the mostly hardware reasons for LAM/TBI.

Lorenzo also raised some very valid points about a having a generic
address-restriction ABI.  I'm certainly not discounting those concerns.
It's not something that can be done lightly.




[Index of Archives]     [Linux Wireless]     [Linux Kernel]     [ATH6KL]     [Linux Bluetooth]     [Linux Netdev]     [Kernel Newbies]     [Share Photos]     [IDE]     [Security]     [Git]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Linux ATA RAID]     [Samba]     [Device Mapper]

  Powered by Linux