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Subject[PATCH] 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?


--- 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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