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| author | Minchan Kim <minchan@kernel.org> | 2013-07-25 13:44:32 +0900 |
|---|---|---|
| committer | MyungJoo Ham <myungjoo.ham@samsung.com> | 2013-11-15 13:52:27 +0900 |
| commit | 30cf4af092fb003edd9c5f6ac87900838deb6f01 (patch) | |
| tree | 07832acd714a2f6742be337465d0ab4536ebd4fc /include | |
| parent | f1f160881562a0a9bc509cab80af79bad4903476 (diff) | |
| download | linux-3.10-30cf4af092fb003edd9c5f6ac87900838deb6f01.tar.gz linux-3.10-30cf4af092fb003edd9c5f6ac87900838deb6f01.tar.bz2 linux-3.10-30cf4af092fb003edd9c5f6ac87900838deb6f01.zip | |
vrange: Add vrange support to mm_structs
This patch addes vroot on mm_struct so process can have volatile
ranges on anonymous memory.
This is somewhat wasteful, as it increases the mm struct even
if the process doesn't use vrange syscall. So an following patch
will make it dynamically allocated.
One of note on this patch is vrange_fork. Its could deadlock with
direct reclaim's purging logic due to vrange_lock so vrange_fork
uses GFP_NOIO.
It does make sense because purging is kind of I/O operation although
it doesn't do anything related to I/O issuing and it could be very
understandable when I will introduce vrange-file, which should avoid
direct purging when caller pass GFP_FS to avoid deadlock.
If vrange_fork fails, it isn't critical because worst case from user
POV is that pages in vrange of parent can't be purged, which is likely
better than having fork fail.
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Android Kernel Team <kernel-team@android.com>
Cc: Robert Love <rlove@google.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Hugh Dickins <hughd@google.com>
Cc: Dave Hansen <dave@linux.vnet.ibm.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Dmitry Adamushko <dmitry.adamushko@gmail.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Neil Brown <neilb@suse.de>
Cc: Andrea Righi <andrea@betterlinux.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Cc: Mike Hommey <mh@glandium.org>
Cc: Taras Glek <tglek@mozilla.com>
Cc: Dhaval Giani <dgiani@mozilla.com>
Cc: Jan Kara <jack@suse.cz>
Cc: KOSAKI Motohiro <kosaki.motohiro@gmail.com>
Cc: Michel Lespinasse <walken@google.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: linux-mm@kvack.org <linux-mm@kvack.org>
Signed-off-by: Minchan Kim <minchan@kernel.org>
[jstultz: Bit of refactoring. Comment cleanups]
Signed-off-by: John Stultz <john.stultz@linaro.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/mm_types.h | 4 | ||||
| -rw-r--r-- | include/linux/vrange.h | 7 |
2 files changed, 10 insertions, 1 deletions
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index 4a189ba6b12..7e14abdada7 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -13,6 +13,7 @@ #include <linux/page-debug-flags.h> #include <linux/uprobes.h> #include <linux/page-flags-layout.h> +#include <linux/vrange_types.h> #include <asm/page.h> #include <asm/mmu.h> @@ -352,6 +353,9 @@ struct mm_struct { */ +#ifdef CONFIG_MMU + struct vrange_root vroot; +#endif unsigned long hiwater_rss; /* High-watermark of RSS usage */ unsigned long hiwater_vm; /* High-water virtual memory usage */ diff --git a/include/linux/vrange.h b/include/linux/vrange.h index 27d4c2e3c98..fc0baf6c613 100644 --- a/include/linux/vrange.h +++ b/include/linux/vrange.h @@ -35,11 +35,16 @@ static inline int vrange_type(struct vrange *vrange) } extern void vrange_root_cleanup(struct vrange_root *vroot); - +extern int vrange_fork(struct mm_struct *new, + struct mm_struct *old); #else static inline void vrange_root_init(struct vrange_root *vroot, int type) {}; static inline void vrange_root_cleanup(struct vrange_root *vroot) {}; +static inline int vrange_fork(struct mm_struct *new, struct mm_struct *old) +{ + return 0; +} #endif #endif /* _LINIUX_VRANGE_H */ |