Several allocations in the ring buffer code scale with buffer capacity or
sub-buffer order and require high-order contiguous physical memory when
using plain kmalloc. Under memory fragmentation or with large buffers,
these allocations can fail unnecessarily.

This series converts those allocations to their kvmalloc equivalents.

Vincent Donnefort (4):
  ring-buffer: Use kvzalloc_objs for user mapping arrays
  ring-buffer: Use kvzalloc_objs for remote buffer subbuf_ids
  ring-buffer: Drop redundant ring_buffer_iter::event_size
  ring-buffer: Use kvmalloc for ring_buffer_iter::event

 kernel/trace/ring_buffer.c | 35 +++++++++++++++++++----------------
 1 file changed, 19 insertions(+), 16 deletions(-)


base-commit: 93f51579e7df248780214094418f205253383cc5
-- 
2.55.0.1082.g2b9226bbc0-goog