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trace: make trace buffer resizeable

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Trace buffers a re-allocated during subsequent calls to 'trace'.

issue #3294
This commit is contained in:
Sebastian Sumpf 2019-05-06 10:42:05 +02:00 committed by Christian Helmuth
parent ac0ecdf855
commit 25484f870e
2 changed files with 42 additions and 15 deletions
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44
repos/base/src/core/include/trace/subject_registry.h
View File

@ -79,19 +79,18 @@ class Genode::Trace::Subject
/**
* Allocate new dataspace
*
* \return true on success, false on the attempt to call setup
* twice.
*/
bool setup(Ram_allocator &ram, size_t size)
void setup(Ram_allocator &ram, size_t size)
{
if (_size && _size == size)
return;
if (_size)
return false;
_ram_ptr->free(_ds);
_ram_ptr = &ram;
_size = size;
_ds = ram.alloc(size);
return true;
}
/**
@ -103,6 +102,9 @@ class Genode::Trace::Subject
if (!from_ds.valid())
return false;
if (_size)
flush();
_ram_ptr = &ram;
_size = size;
_ds = ram.alloc(_size);
@ -144,6 +146,7 @@ class Genode::Trace::Subject
Ram_dataspace _buffer { };
Ram_dataspace _policy { };
Policy_id _policy_id { };
size_t _allocated_memory { 0 };
Subject_info::State _state()
{
@ -162,6 +165,18 @@ class Genode::Trace::Subject
return Subject_info::UNTRACED;
}
void _traceable_or_throw()
{
switch(_state()) {
case Subject_info::DEAD : throw Source_is_dead();
case Subject_info::FOREIGN : throw Traced_by_other_session();
case Subject_info::ERROR : throw Source_is_dead();
case Subject_info::INVALID : throw Nonexistent_subject();
case Subject_info::UNTRACED: return;
case Subject_info::TRACED : return;
}
}
public:
/**
@ -184,6 +199,9 @@ class Genode::Trace::Subject
*/
bool has_source_id(unsigned id) const { return id == _source_id; }
size_t allocated_memory() const { return _allocated_memory; }
void reset_allocated_memory() { _allocated_memory = 0; }
/**
* Start tracing
*
@ -199,21 +217,23 @@ class Genode::Trace::Subject
size_t policy_size, Ram_allocator &ram,
Region_map &local_rm, size_t size)
{
/* check state and throw error in case subject is not traceable */
_traceable_or_throw();
_policy_id = policy_id;
if (!_buffer.setup(ram, size)
|| !_policy.setup(ram, local_rm, policy_ds, policy_size))
throw Already_traced();
_buffer.setup(ram, size);
if(!_policy.setup(ram, local_rm, policy_ds, policy_size))
throw Already_traced();
/* inform trace source about the new buffer */
Locked_ptr<Source> source(_source);
if (!source.valid())
throw Source_is_dead();
if (!source->try_acquire(*this))
throw Traced_by_other_session();
_allocated_memory = policy_size + size;
source->trace(_policy.dataspace(), _buffer.dataspace());
}

13
repos/base/src/core/trace_session_component.cc
View File

@ -82,21 +82,28 @@ void Session_component::trace(Subject_id subject_id, Policy_id policy_id,
size_t const policy_size = _policies.size(*this, policy_id);
size_t const required_ram = buffer_size + policy_size;
Trace::Subject &subject = _subjects.lookup_by_id(subject_id);
/* revert quota from previous call to trace */
if (subject.allocated_memory()) {
_md_alloc.upgrade(subject.allocated_memory());
subject.reset_allocated_memory();
}
/*
* Account RAM needed for trace buffer and policy buffer to the trace
* session.
*/
if (!_md_alloc.withdraw(required_ram))
if (!_md_alloc.withdraw(required_ram)) {
throw Out_of_ram();
}
try {
Trace::Subject &subject = _subjects.lookup_by_id(subject_id);
subject.trace(policy_id, _policies.dataspace(*this, policy_id),
policy_size, _ram, _local_rm, buffer_size);
} catch (...) {
/* revert withdrawal or quota */
_md_alloc.upgrade(required_ram);
throw Out_of_ram();
throw;
}
}