[RFC,0/2] mm, slub: Use stackdepot to store user information for slub object

Message

Imran Khan Aug. 31, 2021, 6:25 a.m. UTC

This series of patches proposes use of STACKDEPOT to
store user (SLAB_STORE_USER) information of a slub object.
As stack traces corresponding to each unique allocation
and freeing context can be saved and retrieved from STACKDEPOT,
we can reduce size of each object (~256 bytes) and hence save
memory without losing any information.

*PATCH-1: Makes STACKDEPOT explicitly configurable, so that
it can be enabled for storing allocation/freeing stack traces.

*PATCH-2: Uses STACKDEPOT to store allocation/freeing context
for a slub object.

I have marked this series as RFC, so that I can get feedback
about this change, because this change just involves debugging
framework and does not add any value to production scenarios.

Imran Khan (2):
  lib, stackdepot: Add input prompt for STACKDEPOT option.
  mm, slub: Use stackdepot to store user information for slub object.

 lib/Kconfig |  3 +-
 mm/slub.c   | 87 +++++++++++++++++++++++++++++------------------------
 2 files changed, 50 insertions(+), 40 deletions(-)