git: hammer2 hammer2 - Integrate CCMS thread lock into hammer2 chain structure

Thu Jun 7 23:59:18 PDT 2012

commit a0ed3c24c92cd8616cf55e46d1776cd2373acb71
Author: Matthew Dillon <dillon at apollo.backplane.com>
Date: Thu Jun 7 23:52:01 2012 -0700
 hammer2 - Integrate CCMS thread lock into hammer2 chain structure

 * Integrate the CCMS thread lock into the hammer2 chain structure.

 * Implement shared and exclusive modes (hammer2 was only really using
 exclusive mode before). Rework all the chain and inode locking functions
 to use CCMS via chain->cst.

 This also required changing the SPLAY trees into RB trees.

 * Start reworking non-modifying VNOPS to use shared CCMS locks.

 * Rework the hammer2_chain_drop() function to avoid deadlocks due to the
 mixed shared/exclusive locks we now support.

 * Major performance improvements for concurrent access. SHARED locks now
 extend to hammer2_chain and hammer2_inode structural accesses, recursions,
 and cached data (buffer cache) accesses.

 In particular, multiple threads can now access the same bp via a
 hammer2_chain locked shared. The bp's themselves are still exclusive
 only (the kernel APIs haven't changed), but the hammer2_chain structure
 can now share the bp's data across several threads accessing it via the
 chain.
Summary of changes:
 sys/vfs/hammer2/Makefile | 2 +-
 sys/vfs/hammer2/hammer2.h | 12 +-
 sys/vfs/hammer2/hammer2_ccms.c | 147 ++++++++++++++--
 sys/vfs/hammer2/hammer2_ccms.h | 4 +
 sys/vfs/hammer2/hammer2_chain.c | 353 ++++++++++++++++++++++++++++----------
 sys/vfs/hammer2/hammer2_inode.c | 34 ++---
 sys/vfs/hammer2/hammer2_subr.c | 10 +-
 sys/vfs/hammer2/hammer2_vfsops.c | 10 +-
 sys/vfs/hammer2/hammer2_vnops.c | 39 +++--
 9 files changed, 462 insertions(+), 149 deletions(-)
http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/a0ed3c24c92cd8616cf55e46d1776cd2373acb71
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