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SubjectOOM fixes 4/5
From: Andrea Arcangeli <andrea@suse.de>
Subject: convert memdie to an atomic thread bitflag

On Sat, Dec 25, 2004 at 03:27:21AM +0100, Andrea Arcangeli wrote:
> So my current plan is to make used_math a PF_USED_MATH, and memdie a
> TIF_MEMDIE. And of course oomtaskadj an int (that one requires more than

This makes memdie a TIF_MEMDIE.

memdie will not be modified by the current task, so it cannot be a
PF_MEMDIE but it must be a TIF_MEMDIE.

Signed-off-by: Andrea Arcangeli <andrea@suse.de>

--- mainline-4/include/asm-alpha/thread_info.h.orig 2004-12-04 08:55:03.000000000 +0100
+++ mainline-4/include/asm-alpha/thread_info.h 2005-01-21 06:17:24.780786576 +0100
@@ -77,6 +77,7 @@ register struct thread_info *__current_t
#define TIF_UAC_NOPRINT 6 /* see sysinfo.h */
#define TIF_UAC_NOFIX 7
#define TIF_UAC_SIGBUS 8
+#define TIF_MEMDIE 9

#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
--- mainline-4/include/asm-arm/thread_info.h.orig 2005-01-04 01:13:27.000000000 +0100
+++ mainline-4/include/asm-arm/thread_info.h 2005-01-21 06:17:24.792784752 +0100
@@ -128,6 +128,7 @@ extern void iwmmxt_task_release(struct t
#define TIF_SYSCALL_TRACE 8
#define TIF_POLLING_NRFLAG 16
#define TIF_USING_IWMMXT 17
+#define TIF_MEMDIE 18

#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
--- mainline-4/include/asm-arm26/thread_info.h.orig 2005-01-15 20:44:58.000000000 +0100
+++ mainline-4/include/asm-arm26/thread_info.h 2005-01-21 06:17:24.797783992 +0100
@@ -126,6 +126,7 @@ extern void free_thread_info(struct thre
#define TIF_SYSCALL_TRACE 8
#define TIF_USED_FPU 16
#define TIF_POLLING_NRFLAG 17
+#define TIF_MEMDIE 18

#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
--- mainline-4/include/asm-cris/thread_info.h.orig 2003-07-10 19:33:07.000000000 +0200
+++ mainline-4/include/asm-cris/thread_info.h 2005-01-21 06:17:24.803783080 +0100
@@ -85,6 +85,7 @@ struct thread_info {
#define TIF_SIGPENDING 2 /* signal pending */
#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
#define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */
+#define TIF_MEMDIE 17

#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
--- mainline-4/include/asm-h8300/thread_info.h.orig 2004-08-25 02:47:35.000000000 +0200
+++ mainline-4/include/asm-h8300/thread_info.h 2005-01-21 06:17:24.814781408 +0100
@@ -93,6 +93,7 @@ static inline struct thread_info *curren
#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
#define TIF_POLLING_NRFLAG 4 /* true if poll_idle() is polling
TIF_NEED_RESCHED */
+#define TIF_MEMDIE 5

/* as above, but as bit values */
#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
--- mainline-4/include/asm-i386/thread_info.h.orig 2005-01-04 01:13:27.000000000 +0100
+++ mainline-4/include/asm-i386/thread_info.h 2005-01-21 06:17:24.828779280 +0100
@@ -141,6 +141,7 @@ register unsigned long current_stack_poi
#define TIF_IRET 5 /* return with iret */
#define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */
#define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */
+#define TIF_MEMDIE 17

#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
--- mainline-4/include/asm-ia64/thread_info.h.orig 2004-12-04 08:55:04.000000000 +0100
+++ mainline-4/include/asm-ia64/thread_info.h 2005-01-21 06:17:24.841777304 +0100
@@ -67,6 +67,7 @@ struct thread_info {
#define TIF_SYSCALL_TRACE 3 /* syscall trace active */
#define TIF_SYSCALL_AUDIT 4 /* syscall auditing active */
#define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */
+#define TIF_MEMDIE 17

#define TIF_WORK_MASK 0x7 /* like TIF_ALLWORK_BITS but sans TIF_SYSCALL_TRACE */
#define TIF_ALLWORK_MASK 0x1f /* bits 0..4 are "work to do on user-return" bits */
--- mainline-4/include/asm-m68k/thread_info.h.orig 2004-08-25 02:47:35.000000000 +0200
+++ mainline-4/include/asm-m68k/thread_info.h 2005-01-21 06:17:24.851775784 +0100
@@ -48,6 +48,7 @@ struct thread_info {
#define TIF_NOTIFY_RESUME 2 /* resumption notification requested */
#define TIF_SIGPENDING 3 /* signal pending */
#define TIF_NEED_RESCHED 4 /* rescheduling necessary */
+#define TIF_MEMDIE 5

extern int thread_flag_fixme(void);

--- mainline-4/include/asm-m68knommu/thread_info.h.orig 2005-01-15 20:44:59.000000000 +0100
+++ mainline-4/include/asm-m68knommu/thread_info.h 2005-01-21 06:17:24.858774720 +0100
@@ -85,6 +85,7 @@ static inline struct thread_info *curren
#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
#define TIF_POLLING_NRFLAG 4 /* true if poll_idle() is polling
TIF_NEED_RESCHED */
+#define TIF_MEMDIE 5

/* as above, but as bit values */
#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
--- mainline-4/include/asm-mips/thread_info.h.orig 2005-01-04 01:13:29.000000000 +0100
+++ mainline-4/include/asm-mips/thread_info.h 2005-01-21 06:17:24.871772744 +0100
@@ -116,6 +116,7 @@ register struct thread_info *__current_t
#define TIF_SYSCALL_AUDIT 4 /* syscall auditing active */
#define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */
#define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */
+#define TIF_MEMDIE 18
#define TIF_SYSCALL_TRACE 31 /* syscall trace active */

#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
--- mainline-4/include/asm-parisc/thread_info.h.orig 2005-01-04 01:13:29.000000000 +0100
+++ mainline-4/include/asm-parisc/thread_info.h 2005-01-21 06:17:24.885770616 +0100
@@ -63,6 +63,7 @@ struct thread_info {
#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
#define TIF_POLLING_NRFLAG 4 /* true if poll_idle() is polling TIF_NEED_RESCHED */
#define TIF_32BIT 5 /* 32 bit binary */
+#define TIF_MEMDIE 6

#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
--- mainline-4/include/asm-ppc/thread_info.h.orig 2005-01-04 01:13:29.000000000 +0100
+++ mainline-4/include/asm-ppc/thread_info.h 2005-01-21 06:17:24.892769552 +0100
@@ -76,6 +76,7 @@ static inline struct thread_info *curren
#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
#define TIF_POLLING_NRFLAG 4 /* true if poll_idle() is polling
TIF_NEED_RESCHED */
+#define TIF_MEMDIE 5
/* as above, but as bit values */
#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
--- mainline-4/include/asm-ppc64/thread_info.h.orig 2005-01-20 18:20:10.000000000 +0100
+++ mainline-4/include/asm-ppc64/thread_info.h 2005-01-21 06:17:50.185924408 +0100
@@ -100,6 +100,7 @@ static inline struct thread_info *curren
#define TIF_ABI_PENDING 7 /* 32/64 bit switch needed */
#define TIF_SYSCALL_AUDIT 8 /* syscall auditing active */
#define TIF_SINGLESTEP 9 /* singlestepping active */
+#define TIF_MEMDIE 10

/* as above, but as bit values */
#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
--- mainline-4/include/asm-s390/thread_info.h.orig 2004-12-04 08:55:04.000000000 +0100
+++ mainline-4/include/asm-s390/thread_info.h 2005-01-21 06:17:24.911766664 +0100
@@ -100,6 +100,7 @@ static inline struct thread_info *curren
#define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling
TIF_NEED_RESCHED */
#define TIF_31BIT 18 /* 32bit process */
+#define TIF_MEMDIE 19

#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
--- mainline-4/include/asm-sh/thread_info.h.orig 2005-01-04 01:13:29.000000000 +0100
+++ mainline-4/include/asm-sh/thread_info.h 2005-01-21 06:17:24.919765448 +0100
@@ -83,6 +83,7 @@ static inline struct thread_info *curren
#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
#define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */
#define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */
+#define TIF_MEMDIE 18
#define TIF_USERSPACE 31 /* true if FS sets userspace */

#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
--- mainline-4/include/asm-sh64/thread_info.h.orig 2004-08-25 02:47:51.000000000 +0200
+++ mainline-4/include/asm-sh64/thread_info.h 2005-01-21 06:17:24.925764536 +0100
@@ -74,6 +74,7 @@ static inline struct thread_info *curren
#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
#define TIF_SIGPENDING 2 /* signal pending */
#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
+#define TIF_MEMDIE 4

#define THREAD_SIZE 16384

--- mainline-4/include/asm-sparc/thread_info.h.orig 2004-08-25 02:47:35.000000000 +0200
+++ mainline-4/include/asm-sparc/thread_info.h 2005-01-21 06:17:24.930763776 +0100
@@ -138,6 +138,7 @@ BTFIXUPDEF_CALL(void, free_thread_info,
* this quantum (SMP) */
#define TIF_POLLING_NRFLAG 9 /* true if poll_idle() is polling
* TIF_NEED_RESCHED */
+#define TIF_MEMDIE 10

/* as above, but as bit values */
#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
--- mainline-4/include/asm-sparc64/thread_info.h.orig 2004-08-25 02:47:57.000000000 +0200
+++ mainline-4/include/asm-sparc64/thread_info.h 2005-01-21 06:17:24.937762712 +0100
@@ -228,6 +228,7 @@ register struct thread_info *current_thr
* an immediate value in instructions such as andcc.
*/
#define TIF_ABI_PENDING 12
+#define TIF_MEMDIE 13

#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
--- mainline-4/include/asm-um/thread_info.h.orig 2005-01-15 20:45:00.000000000 +0100
+++ mainline-4/include/asm-um/thread_info.h 2005-01-21 06:17:24.943761800 +0100
@@ -71,6 +71,7 @@ static inline struct thread_info *curren
* TIF_NEED_RESCHED
*/
#define TIF_RESTART_BLOCK 4
+#define TIF_MEMDIE 5

#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
--- mainline-4/include/asm-v850/thread_info.h.orig 2003-06-17 11:31:42.000000000 +0200
+++ mainline-4/include/asm-v850/thread_info.h 2005-01-21 06:17:24.954760128 +0100
@@ -83,6 +83,7 @@ struct thread_info {
#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
#define TIF_POLLING_NRFLAG 4 /* true if poll_idle() is polling
TIF_NEED_RESCHED */
+#define TIF_MEMDIE 5

/* as above, but as bit values */
#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
--- mainline-4/include/asm-x86_64/thread_info.h.orig 2005-01-04 01:13:29.000000000 +0100
+++ mainline-4/include/asm-x86_64/thread_info.h 2005-01-21 06:17:24.965758456 +0100
@@ -106,6 +106,7 @@ static inline struct thread_info *stack_
#define TIF_IA32 17 /* 32bit process */
#define TIF_FORK 18 /* ret_from_fork */
#define TIF_ABI_PENDING 19
+#define TIF_MEMDIE 20

#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
--- mainline-4/include/linux/sched.h.orig 2005-01-21 06:01:08.585190864 +0100
+++ mainline-4/include/linux/sched.h 2005-01-21 06:17:24.967758152 +0100
@@ -615,11 +615,6 @@ struct task_struct {
struct key *thread_keyring; /* keyring private to this thread */
#endif
/*
- * All archs should support atomic ops with
- * 1 byte granularity.
- */
- unsigned char memdie;
-/*
* Must be changed atomically so it shouldn't be
* be a shareable bitflag.
*/
--- mainline-4/include/asm-m32r/thread_info.h.orig 2005-01-15 20:44:59.000000000 +0100
+++ mainline-4/include/asm-m32r/thread_info.h 2005-01-21 06:18:25.045624928 +0100
@@ -155,6 +155,7 @@ static inline unsigned int get_thread_fa
#define TIF_IRET 5 /* return with iret */
#define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */
/* 31..28 fault code */
+#define TIF_MEMDIE 17

#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
--- mainline-4/mm/oom_kill.c.orig 2005-01-21 06:14:00.290873768 +0100
+++ mainline-4/mm/oom_kill.c 2005-01-21 06:17:24.980756176 +0100
@@ -152,7 +152,8 @@ static struct task_struct * select_bad_p
* This is in the process of releasing memory so wait it
* to finish before killing some other task by mistake.
*/
- if ((p->memdie || (p->flags & PF_EXITING)) && !(p->flags & PF_DEAD))
+ if ((unlikely(test_tsk_thread_flag(p, TIF_MEMDIE)) || (p->flags & PF_EXITING)) &&
+ !(p->flags & PF_DEAD))
return ERR_PTR(-1UL);
if (p->flags & PF_SWAPOFF)
return p;
@@ -196,7 +197,7 @@ static void __oom_kill_task(task_t *p)
* exit() and clear out its resources quickly...
*/
p->time_slice = HZ;
- p->memdie = 1;
+ set_tsk_thread_flag(p, TIF_MEMDIE);

/* This process has hardware access, be more careful. */
if (cap_t(p->cap_effective) & CAP_TO_MASK(CAP_SYS_RAWIO)) {
--- mainline-4/mm/page_alloc.c.orig 2005-01-21 06:09:43.068977440 +0100
+++ mainline-4/mm/page_alloc.c 2005-01-21 06:17:24.996753744 +0100
@@ -756,7 +756,7 @@ __alloc_pages(unsigned int gfp_mask, uns
}

/* This allocation should allow future memory freeing. */
- if (((p->flags & PF_MEMALLOC) || p->memdie) && !in_interrupt()) {
+ if (((p->flags & PF_MEMALLOC) || unlikely(test_thread_flag(TIF_MEMDIE))) && !in_interrupt()) {
/* go through the zonelist yet again, ignoring mins */
for (i = 0; (z = zones[i]) != NULL; i++) {
page = buffered_rmqueue(z, order, gfp_mask);
-
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