[PATCH 0/4] reftable: optimize I/O patterns

Hi,

this patch series optimizes some I/O patterns that the reftable library uses:

  - Establish a stat(3P)-based caching mechanism to avoid re-reading
    "tables.list" all the time.

  - Convert the block source to use mmap(3P) instead of read(3P) to read
    data.

Combined these lead to a ~2.7x speedup when writing many refs.

Patrick

Patrick Steinhardt (4):
  reftable/stack: refactor stack reloading to have common exit path
  reftable/stack: refactor reloading to use file descriptor
  reftable/stack: use stat info to avoid re-reading stack list
  reftable/blocksource: use mmap to read tables

 reftable/blocksource.c |  48 +++++++++++++-----
 reftable/stack.c       | 111 ++++++++++++++++++++++++-----------------
 reftable/stack.h       |   1 +
 reftable/system.h      |   1 +
 4 files changed, 103 insertions(+), 58 deletions(-)