Messages in this thread Patch in this message |  | | Date | Sun, 14 Jan 2001 14:16:55 +0100 | From | Rasmus Andersen <> | Subject | [PATCH] limit mmap_cache nulling (2.2.19-7) |
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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?
--- linux-2.2.19-7/mm/mmap.c~ Sun Jan 14 13:43:50 2001 +++ linux-2.2.19-7/mm/mmap.c Sun Jan 14 14:02:04 2001 @@ -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) -- Regards, Rasmus(rasmus@jaquet.dk)
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