On 12/28/18 at 11:00am, Pingfan Liu wrote: > The bottom-up allocation style is introduced to cope with movable_node, > where the limit inferior of allocation starts from kernel's end, due to > lack of knowledge of memory hotplug info at this early time. > Beside this original aim, 'kexec -c' prefers to reuse this style to alloc mem Wondering what is 'kexec -c'. > at lower address, since if the reserved region is beyond 4G, then it requires > extra mem (default is 16M) for swiotlb. But at this time hotplug info has been The default is 256M, not sure if we are talking about the same thing. low_size = max(swiotlb_size_or_default() + (8UL << 20), 256UL << 20); > got, the limit inferior can be extend to 0, which is done by this series > > Cc: Tang Chen <tangchen@xxxxxxxxxxxxxx> > Cc: "Rafael J. Wysocki" <rjw@xxxxxxxxxxxxx> > Cc: Len Brown <lenb@xxxxxxxxxx> > Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> > Cc: Mike Rapoport <rppt@xxxxxxxxxxxxxxxxxx> > Cc: Michal Hocko <mhocko@xxxxxxxx> > Cc: Jonathan Corbet <corbet@xxxxxxx> > Cc: Yaowei Bai <baiyaowei@xxxxxxxxxxxxxxxxxxxx> > Cc: Pavel Tatashin <pasha.tatashin@xxxxxxxxxx> > Cc: Nicholas Piggin <npiggin@xxxxxxxxx> > Cc: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx> > Cc: Daniel Vacek <neelx@xxxxxxxxxx> > Cc: Mathieu Malaterre <malat@xxxxxxxxxx> > Cc: Stefan Agner <stefan@xxxxxxxx> > Cc: Dave Young <dyoung@xxxxxxxxxx> > Cc: Baoquan He <bhe@xxxxxxxxxx> > Cc: yinghai@xxxxxxxxxx, > Cc: vgoyal@xxxxxxxxxx > Cc: linux-kernel@xxxxxxxxxxxxxxx > > Pingfan Liu (2): > mm/memblock: extend the limit inferior of bottom-up after parsing > hotplug attr > x86/kdump: bugfix, make the behavior of crashkernel=X consistent with > kaslr > > arch/x86/kernel/setup.c | 9 +++++--- > drivers/acpi/numa.c | 4 ++++ > include/linux/memblock.h | 1 + > mm/memblock.c | 58 +++++++++++++++++++++++++++++------------------- > 4 files changed, 46 insertions(+), 26 deletions(-) > > -- > 2.7.4 >
