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https://github.com/RGBCube/serenity
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Kernel: Make it possible to have kmalloc() dump call stacks.
This can be enabled at any time using a sysctl: sysctl kmalloc_stacks=1 The stacks will go to the debugger output only.
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commit
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4 changed files with 14 additions and 0 deletions
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@ -1166,6 +1166,11 @@ ProcFS::ProcFS()
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m_entries[FI_PID_exe] = { "exe", FI_PID_exe, procfs$pid_exe };
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m_entries[FI_PID_cwd] = { "cwd", FI_PID_cwd, procfs$pid_cwd };
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m_entries[FI_PID_fd] = { "fd", FI_PID_fd };
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m_kmalloc_stack_helper.resource() = g_dump_kmalloc_stacks;
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add_sys_bool("kmalloc_stacks", m_kmalloc_stack_helper, [this] {
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g_dump_kmalloc_stacks = m_kmalloc_stack_helper.resource();
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});
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}
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ProcFS::ProcFSDirectoryEntry* ProcFS::get_directory_entry(InodeIdentifier identifier) const
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@ -59,6 +59,7 @@ private:
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mutable Lock m_inodes_lock;
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mutable HashMap<unsigned, ProcFSInode*> m_inodes;
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RetainPtr<ProcFSInode> m_root_inode;
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Lockable<bool> m_kmalloc_stack_helper;
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};
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struct ProcFSInodeCustomData {
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@ -9,6 +9,7 @@
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#include <Kernel/i386.h>
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#include <Kernel/Process.h>
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#include <Kernel/Scheduler.h>
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#include <Kernel/KSyms.h>
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#include <AK/Assertions.h>
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#define SANITIZE_KMALLOC
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@ -35,6 +36,7 @@ volatile size_t kmalloc_sum_eternal = 0;
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dword g_kmalloc_call_count;
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dword g_kfree_call_count;
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bool g_dump_kmalloc_stacks;
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static byte* s_next_eternal_ptr;
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static byte* s_end_of_eternal_range;
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@ -95,6 +97,11 @@ void* kmalloc_impl(size_t size)
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InterruptDisabler disabler;
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++g_kmalloc_call_count;
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if (g_dump_kmalloc_stacks && ksyms_ready) {
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dbgprintf("kmalloc(%u)\n", size);
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dump_backtrace(true);
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}
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// We need space for the allocation_t structure at the head of the block.
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size_t real_size = size + sizeof(allocation_t);
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@ -20,6 +20,7 @@ extern volatile size_t kmalloc_sum_eternal;
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extern volatile size_t kmalloc_sum_page_aligned;
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extern dword g_kmalloc_call_count;
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extern dword g_kfree_call_count;
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extern bool g_dump_kmalloc_stacks;
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inline void* operator new(size_t, void* p) { return p; }
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inline void* operator new[](size_t, void* p) { return p; }
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