pgsql/ oc/src/sgml/wal.sgml rc/backend/access/ ...

CVSROOT: /cvsroot
Module name: pgsql
Changes by: tgl(at)postgresql(dot)org 01/09/29 00:02:27

Modified files:
doc/src/sgml : wal.sgml
src/backend/access/transam: clog.c varsup.c xact.c xlog.c
src/backend/bootstrap: bootparse.y bootstrap.c
src/backend/commands: vacuumlazy.c
src/backend/storage/buffer: README buf_init.c buf_table.c
bufmgr.c freelist.c
src/backend/storage/freespace: freespace.c
src/backend/storage/ipc: ipc.c ipci.c shmem.c sinval.c
sinvaladt.c
src/backend/storage/lmgr: Makefile README deadlock.c lock.c
proc.c s_lock.c spin.c
src/backend/storage/smgr: mm.c smgr.c
src/backend/utils/init: postinit.c
src/backend/utils/misc: guc.c postgresql.conf.sample
src/include/access: clog.h transam.h
src/include : miscadmin.h
src/include/storage: buf_internals.h freespace.h ipc.h lock.h
proc.h s_lock.h shmem.h sinval.h smgr.h
spin.h
Added files:
src/backend/storage/lmgr: lwlock.c
src/include/storage: lwlock.h

Log message:
Implement new 'lightweight lock manager' that's intermediate between
existing lock manager and spinlocks: it understands exclusive vs shared
lock but has few other fancy features. Replace most uses of spinlocks
with lightweight locks. All remaining uses of spinlocks have very short
lock hold times (a few dozen instructions), so tweak spinlock backoff
code to work efficiently given this assumption. All per my proposal on
pghackers 26-Sep-01.