* Moved the vnode structure (to by Vnode class at some time in the future) into

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its own header/source files.
* Changed vnode's bit fields to a single, atomically changeable int32 using
  flags instead. Added respective accessor methods.
* Added a per-vnode mutex-like lock, which uses 2 bits of the structure and
  32 global "buckets" which are used for waiter lists for the vnode locks.
* Reorganized the VFS locking a bit:
  Renamed sVnodeMutex to sVnodeLock and made it an r/w lock. In most situations
  it is now only read-locked to reduce its contention. The per-vnode locks guard
  the fields of the vnode structure and the newly introduced sUnusedVnodesLock
  has taken over the job to guard the unused vnodes list.

The main intent of the changes was to reduce the contention of the sVnodeMutex,
which was partially successful. In my standard -j8 Haiku image build test the
new sUnusedVnodesLock took over about a fourth of the former sVnodeMutex
contention, but the sVnodeLock and the vnode locks have virtually no contention
to speak of, now. A lot of contention migrated to the unrelated "pages" mutex
(another bottleneck). The overall build time dropped about 10 %.



git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34865 a95241bf-73f2-0310-859d-f6bbb57e9c96

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This commit is contained in:

Ingo Weinhold

2010-01-02 23:27:41 +00:00

parent 82cbfd3573

commit 8ccbb7815c

4 changed files with 659 additions and 252 deletions

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src/system/kernel/fs/vfs.cpp

+362 -252

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