genode/repos/base/src/test/slab/main.cc

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/*
* \brief Slab allocator test
* \author Norman Feske
* \date 2015-03-31
*
*/
/*
* Copyright (C) 2015 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU General Public License version 2.
*/
#include <base/env.h>
#include <base/slab.h>
#include <base/log.h>
#include <base/allocator_guard.h>
#include <timer_session/connection.h>
using Genode::size_t;
using Genode::log;
using Genode::error;
struct Array_of_slab_elements
{
Genode::Slab &slab;
size_t const num_elem;
size_t const slab_size;
void **elem;
/**
* Return size of 'elem' array in bytes
*/
size_t _elem_array_size() const { return num_elem*sizeof(void *); }
struct Alloc_failed { };
/**
* Constructor
*
* \throw Alloc_failed
*/
Array_of_slab_elements(Genode::Slab &slab, size_t num_elem, size_t slab_size)
:
slab(slab), num_elem(num_elem), slab_size(slab_size)
{
elem = (void **)Genode::env()->heap()->alloc(_elem_array_size());
log(" allocate ", num_elem, " elements");
for (size_t i = 0; i < num_elem; i++)
if (!slab.alloc(slab_size, &elem[i]))
throw Alloc_failed();
}
~Array_of_slab_elements()
{
log(" free ", num_elem, " elements");
for (size_t i = 0; i < num_elem; i++)
slab.free(elem[i], slab_size);
Genode::env()->heap()->free(elem, _elem_array_size());
}
};
int main(int argc, char **argv)
{
log("--- slab test ---");
static Timer::Connection timer;
enum { SLAB_SIZE = 16, BLOCK_SIZE = 256 };
static Genode::Allocator_guard alloc(Genode::env()->heap(), ~0UL);
{
Genode::Slab slab(SLAB_SIZE, BLOCK_SIZE, nullptr, &alloc);
for (unsigned i = 1; i <= 10; i++) {
log("round ", i, " ("
"used quota: ", alloc.consumed(), " "
"time: ", timer.elapsed_ms(), " ms)");
Array_of_slab_elements array(slab, i*100000, SLAB_SIZE);
log(" allocation completed (used quota: ", alloc.consumed(), ")");
}
log(" finished (used quota: ", alloc.consumed(), ", "
"time: ", timer.elapsed_ms(), " ms)");
/*
* The slab keeps two empty blocks around. For the test, we also need to
* take the overhead of the two block allocations at the heap into
* account.
*/
enum { HEAP_OVERHEAD = 36 };
if (alloc.consumed() > 2*(BLOCK_SIZE + HEAP_OVERHEAD)) {
error("slab failed to release empty slab blocks");
return -1;
}
}
/* validate slab destruction */
log("destructed slab (used quota: ", alloc.consumed(), ")");
if (alloc.consumed() > 0) {
error("slab failed to release all backing store");
return -2;
}
return 0;
}