linux/tools
Matthew Wilcox (Oracle) f9bff0e318 minmax: add in_range() macro
Patch series "New page table range API", v6.

This patchset changes the API used by the MM to set up page table entries.
The four APIs are:

    set_ptes(mm, addr, ptep, pte, nr)
    update_mmu_cache_range(vma, addr, ptep, nr)
    flush_dcache_folio(folio) 
    flush_icache_pages(vma, page, nr)

flush_dcache_folio() isn't technically new, but no architecture
implemented it, so I've done that for them.  The old APIs remain around
but are mostly implemented by calling the new interfaces.

The new APIs are based around setting up N page table entries at once. 
The N entries belong to the same PMD, the same folio and the same VMA, so
ptep++ is a legitimate operation, and locking is taken care of for you. 
Some architectures can do a better job of it than just a loop, but I have
hesitated to make too deep a change to architectures I don't understand
well.

One thing I have changed in every architecture is that PG_arch_1 is now a
per-folio bit instead of a per-page bit when used for dcache clean/dirty
tracking.  This was something that would have to happen eventually, and it
makes sense to do it now rather than iterate over every page involved in a
cache flush and figure out if it needs to happen.

The point of all this is better performance, and Fengwei Yin has measured
improvement on x86.  I suspect you'll see improvement on your architecture
too.  Try the new will-it-scale test mentioned here:
https://lore.kernel.org/linux-mm/20230206140639.538867-5-fengwei.yin@intel.com/
You'll need to run it on an XFS filesystem and have
CONFIG_TRANSPARENT_HUGEPAGE set.

This patchset is the basis for much of the anonymous large folio work
being done by Ryan, so it's received quite a lot of testing over the last
few months.


This patch (of 38):

Determine if a value lies within a range more efficiently (subtraction +
comparison vs two comparisons and an AND).  It also has useful (under some
circumstances) behaviour if the range exceeds the maximum value of the
type.  Convert all the conflicting definitions of in_range() within the
kernel; some can use the generic definition while others need their own
definition.

Link: https://lkml.kernel.org/r/20230802151406.3735276-1-willy@infradead.org
Link: https://lkml.kernel.org/r/20230802151406.3735276-2-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2023-08-24 16:20:18 -07:00
..
accounting
arch tools headers arm64: Sync arm64's cputype.h with the kernel sources 2023-07-14 10:36:16 -03:00
bootconfig
bpf
build perf build: Fix broken feature check for libtracefs due to external lib changes 2023-07-11 13:17:05 -03:00
certs
cgroup
counter
debugging
edid
firewire
firmware
gpio
hv
iio
include selftests: line buffer test program's stdout 2023-08-18 10:12:42 -07:00
io_uring
kvm/kvm_stat
laptop
leds
lib libsubcmd: Avoid SEGV/use-after-free when commands aren't excluded 2023-07-11 16:44:12 -03:00
memory-model
mm
net/ynl tools: ynl-gen: fix parse multi-attr enum attribute 2023-07-26 13:38:23 -07:00
objtool objtool: initialize all of struct elf 2023-07-10 09:52:28 +02:00
pci
pcmcia
perf perf test task_exit: No need for a cycles event to check if we get an PERF_RECORD_EXIT 2023-07-17 10:27:44 -03:00
power platform-drivers-x86 for v6.5-1 2023-06-30 14:50:00 -07:00
rcu
scripts
spi
testing minmax: add in_range() macro 2023-08-24 16:20:18 -07:00
thermal
time
tracing rtla/timerlat_hist: Add timerlat user-space support 2023-06-13 16:41:14 -04:00
usb
verification
virtio tools/virtio: fix build break for aarch64 2023-06-27 10:47:08 -04:00
wmi
workqueue
Makefile