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f25a49ab8a
The patch set splits out 2 small locks from the original big gvt lock:
- vgpu_lock protects per-vGPU data and logic, especially the vGPU
trap emulation path.
- sched_lock protects gvt scheudler structure, context schedule logic
and vGPU's schedule data.
Use vgpu_lock to replace the gvt big lock. By doing this, the
mmio read/write trap path, vgpu virtual event emulation and other
vgpu related process, would be protected under per vgpu_lock.
v9:
- Change commit author since the patches are improved a lot compared
with original version.
Original author: Pei Zhang <pei.zhang@intel.com>
- Rebase to latest gvt-staging.
v8:
- Correct coding and comment style.
- Rebase to latest gvt-staging.
v7:
- Remove gtt_lock since already proteced by gvt_lock and vgpu_lock.
- Fix a typo in intel_gvt_deactivate_vgpu, unlock the wrong lock.
v6:
- Rebase to latest gvt-staging.
v5:
- Rebase to latest gvt-staging.
- intel_vgpu_page_track_handler should use vgpu_lock.
v4:
- Rebase to latest gvt-staging.
- Protect vgpu->active access with vgpu_lock.
- Do not wait gpu idle in vgpu_lock.
v3: update to latest code base
v2: add gvt->lock in function gvt_check_vblank_emulation
Performance comparison on Kabylake platform.
- Configuration:
Host: Ubuntu 16.04.
Guest 1 & 2: Ubuntu 16.04.
glmark2 score comparison:
- Configuration:
Host: glxgears.
Guests: glmark2.
+--------------------------------+-----------------+
| Setup | glmark2 score |
+--------------------------------+-----------------+
| unified lock, iommu=on | 58~62 (avg. 60) |
+--------------------------------+-----------------+
| unified lock, iommu=igfx_off | 57~61 (avg. 59) |
+--------------------------------+-----------------+
| per-logic lock, iommu=on | 60~68 (avg. 64) |
+--------------------------------+-----------------+
| per-logic lock, iommu=igfx_off | 61~67 (avg. 64) |
+--------------------------------+-----------------+
lock_stat comparison:
- Configuration:
Stop lock stat immediately after boot up.
Boot 2 VM Guests.
Run glmark2 in guests.
Start perf lock_stat for 20 seconds and stop again.
- Legend: c - contentions; w - waittime-avg
+------------+-----------------+-----------+---------------+------------+
| | gvt_lock |sched_lock | vgpu_lock | gtt_lock |
+ lock type; +-----------------+-----------+---------------+------------+
| iommu set | c | w | c | w | c | w | c | w |
+------------+-------+---------+----+------+------+--------+-----+------+
| unified; | 20697 | 839 |N/A | N/A | N/A | N/A | N/A | N/A |
| on | | | | | | | | |
+------------+-------+---------+----+------+------+--------+-----+------+
| unified; | 21838 | 658.15 |N/A | N/A | N/A | N/A | N/A | N/A |
| igfx_off | | | | | | | | |
+------------+-------+---------+----+------+------+--------+-----+------+
| per-logic; | 1553 | 1599.96 |9458|429.97| 5846 | 274.33 | 0 | 0.00 |
| on | | | | | | | | |
+------------+-------+---------+----+------+------+--------+-----+------+
| per-logic; | 1911 | 1678.32 |8335|445.16| 5451 | 244.80 | 0 | 0.00 |
| igfx_off | | | | | | | | |
+------------+-------+---------+----+------+------+--------+-----+------+
Signed-off-by: Pei Zhang <pei.zhang@intel.com>
Signed-off-by: Colin Xu <colin.xu@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.