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thread API & CPU session: accounting of CPU quota

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In the init configuration one can configure the donation of CPU time via
'resource' tags that have the attribute 'name' set to "CPU" and the
attribute 'quantum' set to the percentage of CPU quota that init shall
donate. The pattern is the same as when donating RAM quota.

! <start name="test">
!   <resource name="CPU" quantum="75"/>
! </start>

This would cause init to try donating 75% of its CPU quota to the child
"test".  Init and core do not preserve CPU quota for their own
requirements by default as it is done with RAM quota.

The CPU quota that a process owns can be applied through the thread
constructor. The constructor has been enhanced by an argument that
indicates the percentage of the programs CPU quota that shall be granted
to the new thread. So 'Thread(33, "test")' would cause the backing CPU
session to try to grant 33% of the programs CPU quota to the thread
"test". By now, the CPU quota of a thread can't be altered after
construction. Constructing a thread with CPU quota 0 doesn't mean the
thread gets never scheduled but that the thread has no guaranty to receive
CPU time. Such threads have to live with excess CPU time.

Threads that already existed in the official repositories of Genode were
adapted in the way that they receive a quota of 0.

This commit also provides a run test 'cpu_quota' in base-hw (the only
kernel that applies the CPU-quota scheme currently). The test basically
runs three threads with different physical CPU quota. The threads simply
count for 30 seconds each and the test then checks wether the counter
values relate to the CPU-quota distribution.

fix #1275
This commit is contained in:
Martin Stein
2014-10-16 11:15:46 +02:00
committed by Christian Helmuth
parent f60e2af21f
commit 8f9355b360
79 changed files with 898 additions and 187 deletions
Download Patch File Download Diff File Expand all files Collapse all files

34
repos/base-linux/src/core/include/cpu_session_component.h
View File

@ -63,7 +63,7 @@ namespace Genode {
public:
Cpu_thread_component(Session_label const &label,
Cpu_thread_component(size_t, Session_label const &label,
Thread_name const &name,
unsigned priority, addr_t utcb,
Signal_context_capability sigh,
@ -87,6 +87,7 @@ namespace Genode {
bool bound() const { return _bound; }
void bound(bool b) { _bound = b; }
Trace::Source *trace_source() { return &_trace_source; }
size_t quota() { return 0; }
void sigh(Signal_context_capability sigh)
{
@ -115,6 +116,7 @@ namespace Genode {
private:
Session_label _label;
Rpc_entrypoint *_session_ep;
Rpc_entrypoint *_thread_ep;
Pager_entrypoint *_pager_ep;
Allocator_guard _md_alloc; /* guarded meta-data allocator */
@ -129,6 +131,24 @@ namespace Genode {
session */
Trace::Source_registry &_trace_sources;
Trace::Control_area _trace_control_area;
Cpu_session_component * _ref;
size_t _used;
size_t _quota;
List<Cpu_session_component> _ref_members;
Lock _ref_members_lock;
size_t _global_to_local(size_t const q) const { return 0; }
size_t _avail() { return 0; }
void _deinit_ref_account();
void _deinit_threads();
size_t _local_to_global(size_t) const { return 0; }
void _insuff_for_consume(size_t);
int _insuff_for_transfer(size_t);
int _transfer_back(size_t) { return -1; }
int _transfer_forth(Cpu_session_component *, size_t) { return -1; }
void _insert_ref_member(Cpu_session_component *) { }
void _remove_ref_member(Cpu_session_component *) { }
void _unsync_remove_ref_member(Cpu_session_component *) { }
/**
* Exception handler that will be invoked unless overridden by a
@ -151,11 +171,13 @@ namespace Genode {
/**
* Constructor
*/
Cpu_session_component(Rpc_entrypoint *thread_ep,
Cpu_session_component(Rpc_entrypoint *session_ep,
Rpc_entrypoint *thread_ep,
Pager_entrypoint *pager_ep,
Allocator *md_alloc,
Trace::Source_registry &trace_sources,
const char *args, Affinity const &affinity);
const char *args, Affinity const &affinity,
size_t quota);
/**
* Destructor
@ -172,7 +194,7 @@ namespace Genode {
** CPU session interface **
***************************/
Thread_capability create_thread(Name const &, addr_t);
Thread_capability create_thread(size_t, Name const &, addr_t);
Ram_dataspace_capability utcb(Thread_capability thread);
void kill_thread(Thread_capability);
int set_pager(Thread_capability, Pager_capability);
@ -190,6 +212,10 @@ namespace Genode {
unsigned trace_control_index(Thread_capability);
Dataspace_capability trace_buffer(Thread_capability);
Dataspace_capability trace_policy(Thread_capability);
int ref_account(Cpu_session_capability c);
int transfer_quota(Cpu_session_capability c, size_t q);
size_t used();
size_t quota();
/*******************************

2
repos/base-linux/src/core/thread_linux.cc
View File

@ -46,7 +46,7 @@ void Thread_base::_thread_start()
}
void Thread_base::_init_platform_thread(Type) { }
void Thread_base::_init_platform_thread(size_t, Type) { }
void Thread_base::_deinit_platform_thread() { }