Benjamin Herrenschmidt wrote: > This patch changes vmemmap to use a different region (region 0xf) of the > address space whose page size can be dynamically configured at boot. > > The problem with the current approach of always using 16M pages is that > it's not well suited to machines that have small amounts of memory such > as small partitions on pseries, or PS3's. > > In fact, on the PS3, failure to allocate the 16M page backing vmmemmap > tends to prevent hotplugging the HV's "additional" memory, thus limiting > the available memory even more, from my experience down to something > like 80M total, which makes it really not very useable. > > The logic used by my match to choose the vmemmap page size is: > > - If 16M pages are available and there's 1G or more RAM at boot, use that > size. > - Else if 64K pages are available, use that > - Else use 4K pages
It doesn't seem to cause problems on PS3, and I added it into ps3-linux.git as other/powerpc-vmemmap-variable-page-size.diff, but I couldn't get it to fail without the patch... Could you send me your kernel .config? -Geoff _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
