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Free physical pages allocated for a process's page directory on exit.

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Also use a ProcessPagingScope instead of region aliasing to implement
create-process ELF loading.
This commit is contained in:
Andreas Kling 2018-11-01 23:04:34 +01:00
parent c70afd045e
commit 90ddbca127
Notes: sideshowbarker 2024-07-19 18:34:37 +09:00
8 changed files with 113 additions and 55 deletions
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46
Kernel/init.cpp
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@ -49,13 +49,20 @@ static byte parseHexDigit(char nibble)
return 10 + (nibble - 'a');
}
#ifdef KSYMS
static Vector<KSym, KmallocEternalAllocator>* s_ksyms;
static bool s_ksyms_ready;
Vector<KSym, KmallocEternalAllocator>& ksyms()
{
return *s_ksyms;
}
volatile bool ksyms_ready()
{
return s_ksyms_ready;
}
const KSym* ksymbolicate(dword address)
{
if (address < ksyms().first().address || address > ksyms().last().address)
@ -90,8 +97,38 @@ static void loadKsyms(const ByteBuffer& buffer)
ksyms().append({ address, String(startOfName, bufptr - startOfName) });
++bufptr;
}
s_ksyms_ready = true;
}
void dump_backtrace()
{
if (!current)
return;
extern volatile bool ksyms_ready();
if (!ksyms_ready())
return;
dword stack_variable;
struct RecognizedSymbol {
dword address;
const KSym* ksym;
};
Vector<RecognizedSymbol> recognizedSymbols;
for (dword* stackPtr = &stack_variable; current->isValidAddressForKernel(LinearAddress((dword)stackPtr)); stackPtr = (dword*)*stackPtr) {
dword retaddr = stackPtr[1];
if (auto* ksym = ksymbolicate(retaddr))
recognizedSymbols.append({ retaddr, ksym });
}
size_t bytesNeeded = 0;
for (auto& symbol : recognizedSymbols) {
bytesNeeded += symbol.ksym->name.length() + 8 + 16;
}
for (auto& symbol : recognizedSymbols) {
unsigned offset = symbol.address - symbol.ksym->address;
dbgprintf("%p %s +%u\n", symbol.address, symbol.ksym->name.characters(), offset);
}
}
#endif
static void undertaker_main() NORETURN;
static void undertaker_main()
{
@ -109,8 +146,8 @@ static void spawn_stress()
for (unsigned i = 0; i < 10000; ++i) {
int error;
Process::createUserProcess("/bin/id", (uid_t)100, (gid_t)100, (pid_t)0, error, nullptr, tty0);
kprintf("malloc stats: alloc:%u free:%u page_aligned:%u eternal:%u\n", sum_alloc, sum_free, kmalloc_page_aligned, kmalloc_sum_eternal);
kprintf("delta:%u\n", sum_alloc - lastAlloc);
// kprintf("malloc stats: alloc:%u free:%u page_aligned:%u eternal:%u\n", sum_alloc, sum_free, kmalloc_page_aligned, kmalloc_sum_eternal);
// kprintf("delta:%u\n", sum_alloc - lastAlloc);
lastAlloc = sum_alloc;
sleep(60);
}
@ -223,6 +260,11 @@ void init()
{
cli();
#ifdef KSYMS
s_ksyms = nullptr;
s_ksyms_ready = false;
#endif
kmalloc_init();
vga_init();