limit mmap_cache nulling (2.2.19-7)
Subsystems (2)
PATCH 1/1 limit mmap_cache nulling (2.2.19-7)
Hi.
The following patch against 2.2.19-7 adds checks in do_munmap and merge_segments to limit the nulling of mmap_cache to the cases where the cached vma is in the affected area.
Comments?
mm/mmap.c renamed from mm/mmap.c~ +7 -2
@@ -689,8 +689,11 @@kmem_cache_free (vm_area_cachep, extra);free_pgtables (mm, prev, addr, addr+len); + +if (mm->mmap_cache && mm->mmap_cache->vm_start < addr+len + && mm->mmap_cache->vm_end > addr) + mm->mmap_cache =NULL ;/* Kill the cache. */ - mm->mmap_cache =NULL ;/* Kill the cache. */ return 0 ; }
@@ -867,7 +870,9 @@kmem_cache_free (vm_area_cachep, mpnt); mpnt = prev; } - mm->mmap_cache =NULL ;/* Kill the cache. */ +if (mm->mmap_cache && mm->mmap_cache->vm_start < end_addr + && mm->mmap_cache->vm_end > start_addr) + mm->mmap_cache =NULL ;/* Kill the cache. */ }void __init vma_init (void )
Signature · 11 lines
Regards,
Rasmus([email protected])
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