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base: new 'Ram_allocator' interface

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The 'Ram_allocator' interface contains the subset of the RAM session
interface that is needed to satisfy the needs of the 'Heap' and
'Sliced_heap'. Its small size makes it ideal for intercepting memory
allocations as done by the new 'Constrained_ram_allocator' wrapper
class, which is meant to replace the existing 'base/allocator_guard.h'
and 'os/ram_session_guard.h'.

Issue #2398
This commit is contained in:
Norman Feske
2017-05-07 23:49:43 +02:00
committed by Christian Helmuth
parent 5a468919bb
commit ff68d77c7d
21 changed files with 297 additions and 136 deletions
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21
repos/os/src/server/loader/ram_session_client_guard.h
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@ -25,16 +25,16 @@ namespace Genode {
{
private:
size_t _amount; /* total amount */
size_t _consumed; /* already consumed bytes */
Lock _consumed_lock;
size_t const _amount; /* total amount */
size_t _consumed; /* already consumed bytes */
Lock mutable _consumed_lock;
public:
Ram_session_client_guard(Ram_session_capability session, size_t amount)
: Ram_session_client(session), _amount(amount), _consumed(0) { }
Ram_dataspace_capability alloc(size_t size, Cache_attribute cached)
Ram_dataspace_capability alloc(size_t size, Cache_attribute cached) override
{
Lock::Guard _consumed_lock_guard(_consumed_lock);
@ -52,7 +52,7 @@ namespace Genode {
return cap;
}
void free(Ram_dataspace_capability ds)
void free(Ram_dataspace_capability ds) override
{
Lock::Guard _consumed_lock_guard(_consumed_lock);
@ -61,7 +61,12 @@ namespace Genode {
Ram_session_client::free(ds);
}
int transfer_quota(Ram_session_capability ram_session, size_t amount)
size_t dataspace_size(Ram_dataspace_capability ds) const override
{
return Ram_session_client::dataspace_size(ds);
}
int transfer_quota(Ram_session_capability ram_session, size_t amount) override
{
Lock::Guard _consumed_lock_guard(_consumed_lock);
@ -79,12 +84,12 @@ namespace Genode {
return result;
}
size_t quota()
size_t quota() override
{
return _amount;
}
size_t used()
size_t used() override
{
Lock::Guard _consumed_lock_guard(_consumed_lock);
return _consumed;