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Kernel: Make it possible to have kmalloc() dump call stacks.

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This can be enabled at any time using a sysctl:

    sysctl kmalloc_stacks=1

The stacks will go to the debugger output only.
This commit is contained in:
Andreas Kling 2019-04-15 23:58:48 +02:00
parent bc6ac1c2f2
commit d384c7815f
4 changed files with 14 additions and 0 deletions
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5
Kernel/FileSystem/ProcFS.cpp
View file

@ -1166,6 +1166,11 @@ ProcFS::ProcFS()
m_entries[FI_PID_exe] = { "exe", FI_PID_exe, procfs$pid_exe }; m_entries[FI_PID_exe] = { "exe", FI_PID_exe, procfs$pid_exe };
m_entries[FI_PID_cwd] = { "cwd", FI_PID_cwd, procfs$pid_cwd }; m_entries[FI_PID_cwd] = { "cwd", FI_PID_cwd, procfs$pid_cwd };
m_entries[FI_PID_fd] = { "fd", FI_PID_fd }; m_entries[FI_PID_fd] = { "fd", FI_PID_fd };
m_kmalloc_stack_helper.resource() = g_dump_kmalloc_stacks;
add_sys_bool("kmalloc_stacks", m_kmalloc_stack_helper, [this] {
g_dump_kmalloc_stacks = m_kmalloc_stack_helper.resource();
});
} }
ProcFS::ProcFSDirectoryEntry* ProcFS::get_directory_entry(InodeIdentifier identifier) const ProcFS::ProcFSDirectoryEntry* ProcFS::get_directory_entry(InodeIdentifier identifier) const

1
Kernel/FileSystem/ProcFS.h
View file

@ -59,6 +59,7 @@ private:
mutable Lock m_inodes_lock; mutable Lock m_inodes_lock;
mutable HashMap<unsigned, ProcFSInode*> m_inodes; mutable HashMap<unsigned, ProcFSInode*> m_inodes;
RetainPtr<ProcFSInode> m_root_inode; RetainPtr<ProcFSInode> m_root_inode;
Lockable<bool> m_kmalloc_stack_helper;
}; };
struct ProcFSInodeCustomData { struct ProcFSInodeCustomData {

7
Kernel/kmalloc.cpp
View file

@ -9,6 +9,7 @@
#include <Kernel/i386.h> #include <Kernel/i386.h>
#include <Kernel/Process.h> #include <Kernel/Process.h>
#include <Kernel/Scheduler.h> #include <Kernel/Scheduler.h>
#include <Kernel/KSyms.h>
#include <AK/Assertions.h> #include <AK/Assertions.h>
#define SANITIZE_KMALLOC #define SANITIZE_KMALLOC
@ -35,6 +36,7 @@ volatile size_t kmalloc_sum_eternal = 0;
dword g_kmalloc_call_count; dword g_kmalloc_call_count;
dword g_kfree_call_count; dword g_kfree_call_count;
bool g_dump_kmalloc_stacks;
static byte* s_next_eternal_ptr; static byte* s_next_eternal_ptr;
static byte* s_end_of_eternal_range; static byte* s_end_of_eternal_range;
@ -95,6 +97,11 @@ void* kmalloc_impl(size_t size)
InterruptDisabler disabler; InterruptDisabler disabler;
++g_kmalloc_call_count; ++g_kmalloc_call_count;
if (g_dump_kmalloc_stacks && ksyms_ready) {
dbgprintf("kmalloc(%u)\n", size);
dump_backtrace(true);
}
// We need space for the allocation_t structure at the head of the block. // We need space for the allocation_t structure at the head of the block.
size_t real_size = size + sizeof(allocation_t); size_t real_size = size + sizeof(allocation_t);

1
Kernel/kmalloc.h
View file

@ -20,6 +20,7 @@ extern volatile size_t kmalloc_sum_eternal;
extern volatile size_t kmalloc_sum_page_aligned; extern volatile size_t kmalloc_sum_page_aligned;
extern dword g_kmalloc_call_count; extern dword g_kmalloc_call_count;
extern dword g_kfree_call_count; extern dword g_kfree_call_count;
extern bool g_dump_kmalloc_stacks;
inline void* operator new(size_t, void* p) { return p; } inline void* operator new(size_t, void* p) { return p; }
inline void* operator new[](size_t, void* p) { return p; } inline void* operator new[](size_t, void* p) { return p; }