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core-linux: make RAM quota configurable

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Add the option to configure the RAM quota for core on base-linux.
The environment variable GENODE_RAM_QUOTA if it exists is interpreted
as number of bytes to provide to the first init.

Issue #3762
This commit is contained in:
Pirmin Duss 2020-05-13 10:48:25 +02:00 committed by Christian Helmuth
parent 51104454aa
commit 7f6b6d7e13
1 changed files with 24 additions and 1 deletions
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25
repos/base-linux/src/core/include/platform.h
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@ -24,6 +24,29 @@
#include <synced_range_allocator.h>
#include <assertion.h>
#include <util/arg_string.h>
/**
* List of Unix environment variables, initialized by the startup code
*/
extern char **lx_environ;
/**
* Read environment variable as long value
*/
static unsigned long ram_quota_from_env()
{
for (char **curr = lx_environ; curr && *curr; curr++) {
Genode::Arg arg = Genode::Arg_string::find_arg(*curr, "GENODE_RAM_QUOTA");
if (arg.valid())
return arg.ulong_value(~0);
}
return ~0;
}
namespace Genode {
using namespace Genode;
@ -87,7 +110,7 @@ namespace Genode {
int remove_range(addr_t, size_t) override { return 0; }
void free(void *) override { }
void free(void *, size_t) override { }
size_t avail() const override { return ~0; }
size_t avail() const override { return ram_quota_from_env(); }
bool valid_addr(addr_t) const override { return true; }
size_t overhead(size_t) const override { return 0; }
bool need_size_for_free() const override { return true; }