[PATCH] Avoiding mmap fragmentation

[linux-2.6] / arch / sparc64 / kernel / sys_sparc.c

diff --git a/arch/sparc64/kernel/sys_sparc.c b/arch/sparc64/kernel/sys_sparc.c
index 0077f02f4b374e34ced8a57e03490a6dd06c2165..5f8c822a2b4a4a3dbcdab26809d94a90679682d8 100644 (file)
--- a/arch/sparc64/kernel/sys_sparc.c
+++ b/arch/sparc64/kernel/sys_sparc.c
@@ -84,6 +84,10 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsi
                        return addr;
        }
 
+       if (len <= mm->cached_hole_size) {
+               mm->cached_hole_size = 0;
+               mm->free_area_cache = TASK_UNMAPPED_BASE;
+       }
        start_addr = addr = mm->free_area_cache;
 
        task_size -= len;
@@ -103,6 +107,7 @@ full_search:
                if (task_size < addr) {
                        if (start_addr != TASK_UNMAPPED_BASE) {
                                start_addr = addr = TASK_UNMAPPED_BASE;
+                               mm->cached_hole_size = 0;
                                goto full_search;
                        }
                        return -ENOMEM;
@@ -114,6 +119,9 @@ full_search:
                        mm->free_area_cache = addr + len;
                        return addr;
                }
+               if (addr + mm->cached_hole_size < vma->vm_start)
+                       mm->cached_hole_size = vma->vm_start - addr;
+
                addr = vma->vm_end;
                if (do_color_align)
                        addr = COLOUR_ALIGN(addr, pgoff);