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Shuicheng Lin
4a7fe36a12
Add a limit to the number of jobs that can be queued in a single exec queue to avoid potential resource exhaustion. A new field `job_cnt` is introduced in `struct xe_exec_queue` to track the number of active DRM jobs, along with a maximum limit `XE_MAX_JOB_COUNT_PER_EXEC_QUEUE` set to 1000. If the job count exceeds this threshold, `xe_exec_ioctl()` now returns `-EAGAIN` to signal that the caller should retry later. A trace event is added to track when the limit is reached: "xe_exec_queue_reach_max_job_count: dev=0000:03:00.0, job count exceeded the maximum limit (1000) per exec queue. engine_class=0x3, logical_mask=0x1, guc_id=2" v3: add assert in xe_exec_queue_destroy that q->job_cnt is zero. (Matt) v2 (Matt): - add log to trace the limit is hit. - Change max count from 0x1000 to 1000. - Use atomic_t for job_cnt. Suggested-by: Matthew Brost <matthew.brost@intel.com> Signed-off-by: Shuicheng Lin <shuicheng.lin@intel.com> Reviewed-by: Matthew Brost <matthew.brost@intel.com> Signed-off-by: Matthew Brost <matthew.brost@intel.com> Link: https://patch.msgid.link/20251027202118.3339905-2-shuicheng.lin@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 reStructuredText markup notation.
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.