Date: Tue, 25 Feb 2003 20:46:21 -0800 (PST) From: Scott Long <scottl@FreeBSD.org> To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/dev/aac aac.c aac_cam.c aac_disk.c aacvar.h Message-ID: <200302260446.h1Q4kLO6042833@repoman.freebsd.org>
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scottl 2003/02/25 20:46:21 PST
Modified files:
sys/dev/aac aac.c aac_cam.c aac_disk.c aacvar.h
Log:
Bring aac out from under Giant:
- the mutex aac_io_lock protects the main codepaths which handle queues and
hardware registers. Only one acquire/release is done in the top-half and
the taskqueue. This mutex also applies to the userland command path and
CAM data path.
- Move the taskqueue to the new Giant-free version.
- Register the disk device with DISKFLAG_NOGIANT so the top-half processing
runs without Giant.
- Move the dynamic command allocator to the worker thread to avoid locking
issues with bus_dmamem_alloc().
This gives about 20% improvement in most of my benchmarks.
Revision Changes Path
1.60 +32 -15 src/sys/dev/aac/aac.c
1.8 +4 -0 src/sys/dev/aac/aac_cam.c
1.29 +5 -2 src/sys/dev/aac/aac_disk.c
1.29 +5 -1 src/sys/dev/aac/aacvar.h
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