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Without proxy-exec, we normally charge the "current" task for both its vruntime as well as its sum_exec_runtime. With proxy, however, we have two "current" contexts: the scheduler context and the execution context. We want to charge the execution context rq->curr (ie: proxy/lock holder) execution time to its sum_exec_runtime (so it's clear to userland the rq->curr task *is* running), as well as its thread group. However the rest of the time accounting (such a vruntime and cgroup accounting), we charge against the scheduler context (rq->donor) task, because it is from that task that the time is being "donated". If the donor and curr tasks are the same, then it's the same as without proxy. Signed-off-by: John Stultz <jstultz@google.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Tested-by: K Prateek Nayak <kprateek.nayak@amd.com> Link: https://lkml.kernel.org/r/20250712033407.2383110-6-jstultz@google.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.