[Minios-devel] [UNIKRAFT PATCH v4 0/4] add support for generic memory allocators

[Hugo Lefeuvre <hugo.lefeuvre@xxxxxxxxx>]

This patch series addresses a few bugs and design issues in ukalloc in
order to ease the port of new allocators to unikraft.

"lib/ukalloc: use size instead of order in palloc and pfree apis" updates
the palloc and pfree api to take size parameters instead of order.

Furthermore "lib/ukalloc: implement new allocator helpers" implements new
helpers for generic, malloc based memory allocators.

Unfortunately, using this patch with a generic allocator results in page
fault during uk_thread_current because the stack is not aligned at
STACK_SIZE.

This is because the stack is allocated via palloc and not posix_memalign,
hence only guaranteeing page alignment.

We address this issue in "lib/uksched: use posix_memalign to allocate
stack" and "lib/ukalloc: fix multiple issues in uk_posix_memalign_ifpages"
which adds support for alignment > page size to uk_posix_memalign_ifpages.

This patch also addresses an out-of-bounds issue in
uk_posix_memalign_ifpages with allocation aligned at less than a page.

Changes v4:
  - call uk_palloc and uk_pfree with size argument __PAGE_SIZE in uk_malloc_page
    and uk_free_page.

Hugo Lefeuvre (4):
  lib/ukalloc: use size instead of order in palloc and pfree apis
  lib/ukalloc: fix multiple issues in uk_posix_memalign_ifpages
  lib/uksched: use posix_memalign to allocate stack
  lib/ukalloc: implement new allocator helpers

 lib/ukalloc/alloc.c                 | 149 +++++++++++++++++++++---------------
 lib/ukalloc/exportsyms.uk           |   3 +
 lib/ukalloc/include/uk/alloc.h      |  25 +++---
 lib/ukalloc/include/uk/alloc_impl.h |  22 +++++-
 lib/ukallocbbuddy/bbuddy.c          |  18 ++++-
 lib/uksched/sched.c                 |   4 +-
 plat/xen/drivers/9p/9pfront.c       |  20 ++---
 7 files changed, 154 insertions(+), 87 deletions(-)

-- 
2.7.4


_______________________________________________
Minios-devel mailing list
Minios-devel@xxxxxxxxxxxxxxxxxxxx
https://lists.xenproject.org/mailman/listinfo/minios-devel