* Re: [uml-devel] UML is leaking memory in arch_dup_mmap
2008-01-18 14:42 [uml-devel] UML is leaking memory in arch_dup_mmap Miklos Szeredi
@ 2008-01-18 18:07 ` Jeff Dike
2008-01-18 18:29 ` Miklos Szeredi
0 siblings, 1 reply; 3+ messages in thread
From: Jeff Dike @ 2008-01-18 18:07 UTC (permalink / raw)
To: Miklos Szeredi; +Cc: linux-kernel, user-mode-linux-devel
On Fri, Jan 18, 2008 at 03:42:54PM +0100, Miklos Szeredi wrote:
> uml:~# grep arch_dup_mmap /proc/slab_allocators
> size-32: 10861 arch_dup_mmap+0x9f/0x130
Whoops - try the patch below.
Jeff
--
Work email - jdike at linux dot intel dot com
Index: linux-2.6.22/arch/um/include/um_mmu.h
===================================================================
--- linux-2.6.22.orig/arch/um/include/um_mmu.h 2008-01-17 13:44:49.000000000 -0500
+++ linux-2.6.22/arch/um/include/um_mmu.h 2008-01-18 12:53:10.000000000 -0500
@@ -17,6 +17,7 @@ typedef struct mm_context {
unsigned long last_pmd;
#endif
struct uml_ldt ldt;
+ struct page **stub_pages;
} mm_context_t;
extern void __switch_mm(struct mm_id * mm_idp);
Index: linux-2.6.22/arch/um/kernel/skas/mmu.c
===================================================================
--- linux-2.6.22.orig/arch/um/kernel/skas/mmu.c 2008-01-18 13:02:52.000000000 -0500
+++ linux-2.6.22/arch/um/kernel/skas/mmu.c 2008-01-18 13:04:42.000000000 -0500
@@ -91,6 +91,8 @@ int init_new_context(struct task_struct
goto out_free;
}
+ to_mm->stub_pages = NULL;
+
return 0;
out_free:
@@ -126,6 +128,7 @@ void arch_dup_mmap(struct mm_struct *old
pages[0] = virt_to_page(&__syscall_stub_start);
pages[1] = virt_to_page(mm->context.id.stack);
+ mm->context.stub_pages = pages;
/* dup_mmap already holds mmap_sem */
err = install_special_mapping(mm, STUB_START, STUB_END - STUB_START,
@@ -147,6 +150,8 @@ void arch_exit_mmap(struct mm_struct *mm
{
pte_t *pte;
+ if(mm->context.stub_pages != NULL)
+ kfree(mm->context.stub_pages);
pte = virt_to_pte(mm, STUB_CODE);
if (pte != NULL)
pte_clear(mm, STUB_CODE, pte);
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