Messages in this thread Patch in this message | | | Date | Tue, 31 Mar 2009 15:03:19 +0200 | From | Markus Metzger <> | Subject | [patch 4/21] mm: refund memory for a locked buffer |
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Add a function to refund the memory of a locked buffer.
The function will be used by a worker thread to free a buffer allocated by a different task and to refund the memory correctly.
Signed-off-by: Markus Metzger <markus.t.metzger@intel.com> ---
Index: git-tip/include/linux/mm.h =================================================================== --- git-tip.orig/include/linux/mm.h 2009-03-28 13:04:30.000000000 +0100 +++ git-tip/include/linux/mm.h 2009-03-28 13:07:53.000000000 +0100 @@ -13,6 +13,7 @@ #include <linux/prio_tree.h> #include <linux/debug_locks.h> #include <linux/mm_types.h> +#include <linux/sched.h> struct mempolicy; struct anon_vma; @@ -1318,6 +1319,6 @@ extern void *alloc_locked_buffer(size_t size); extern void free_locked_buffer(void *buffer, size_t size); -extern void release_locked_buffer(void *buffer, size_t size); +extern void refund_locked_buffer_memory(struct mm_struct *mm, size_t size); #endif /* __KERNEL__ */ #endif /* _LINUX_MM_H */ Index: git-tip/mm/mlock.c =================================================================== --- git-tip.orig/mm/mlock.c 2009-03-28 13:04:30.000000000 +0100 +++ git-tip/mm/mlock.c 2009-03-28 13:08:53.000000000 +0100 @@ -660,21 +660,20 @@ return buffer; } -void release_locked_buffer(void *buffer, size_t size) +void refund_locked_buffer_memory(struct mm_struct *mm, size_t size) { unsigned long pgsz = PAGE_ALIGN(size) >> PAGE_SHIFT; - down_write(¤t->mm->mmap_sem); + down_write(&mm->mmap_sem); - current->mm->total_vm -= pgsz; - current->mm->locked_vm -= pgsz; + mm->total_vm -= pgsz; + mm->locked_vm -= pgsz; - up_write(¤t->mm->mmap_sem); + up_write(&mm->mmap_sem); } void free_locked_buffer(void *buffer, size_t size) { - release_locked_buffer(buffer, size); - + refund_locked_buffer_memory(current->mm, size); kfree(buffer); } --------------------------------------------------------------------- Intel GmbH Dornacher Strasse 1 85622 Feldkirchen/Muenchen Germany Sitz der Gesellschaft: Feldkirchen bei Muenchen Geschaeftsfuehrer: Douglas Lusk, Peter Gleissner, Hannes Schwaderer Registergericht: Muenchen HRB 47456 Ust.-IdNr. VAT Registration No.: DE129385895 Citibank Frankfurt (BLZ 502 109 00) 600119052 This e-mail and any attachments may contain confidential material for the sole use of the intended recipient(s). Any review or distribution by others is strictly prohibited. If you are not the intended recipient, please contact the sender and delete all copies.
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