On 06/11/2015 06:07 AM, Mark Rutland wrote:
On Thu, Jun 04, 2015 at 08:15:49PM +0100, Laura Abbott wrote:The memblock limit is currently used in find_limits to find the bounds for ZONE_NORMAL. The memblock limit may need to be rounded down a PMD size to ensure allocations are fully mapped though. This has the side effect of reducing the amount of memory in ZONE_NORMAL. Once all lowmem is mapped, it's safe to change the memblock limit back to include the unaligned section. Adjust the memblock limit after lowmem mapping is complete. Before: # cat /proc/zoneinfo | grep managed managed 62907 managed 424 After: # cat /proc/zoneinfo | grep managed managed 63331 Signed-off-by: Laura Abbott <[email protected]> --- This is a replacement for 'arm: Don't use memblock limit for the lowmem bound' which doesn't actually work on NOMMU systems.Works for me on TC2, atop v4.1-rc7. Before this patch, with a few byes carved out of the memory node I would see: Memory: 1030380K/1046528K available (4832K kernel code, 154K rwdata, 1376K rodata, 260K init, 147K bss, 16148K reserved, 0K cma-reserved) $ cat /proc/zoneinfo | grep managed managed 257660 With the patch I see: Memory: 1032424K/1048572K available (4832K kernel code, 154K rwdata, 1376K rodata, 260K init, 147K bss, 16148K reserved, 0K cma-reserved) $ cat /proc/zoneinfo | grep managed managed 258171 The patch itself looks good to me. Reviewed-by: Mark Rutland <[email protected]> Tested-by: Mark Rutland <[email protected]> Thanks, Mark.
FYI, I put this in the patch tracker. I was on vacation when the Reviewed-by/Tested-by came in so I'm only getting to it now. Thanks, Laura -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
