[0/4] gracefully handling mmap failures

Message

Eric Wong June 29, 2021, 8:11 a.m. UTC

With an out-of-the-box Linux kernel, I encountered failures at
all of these mmap call sites via "git cat-file --batch" on a
test repo with 100K total alternates.

While upping sys.vm.max_map_count and/or RLIMIT_DATA solves the
problem, not all users have administrative privileges to do so.

Eric Wong (4):
  use_pack: attempt to handle ENOMEM from mmap
  map_loose_object_1: attempt to handle ENOMEM from mmap
  check_packed_git_idx: attempt to handle ENOMEM from mmap
  xmmap: inform Linux users of tuning knobs on ENOMEM

 object-file.c | 16 ++++++++++++++--
 packfile.c    | 17 ++++++++++++-----
 packfile.h    |  2 ++
 3 files changed, 28 insertions(+), 7 deletions(-)