Cheesy maybe, effective probably.
-- Jeff Garzik | Liberty is always dangerous, but Building 1024 | it is the safest thing we have. MandrakeSoft, Inc. | -- Harry Emerson Fosdick
Index: mm/vmscan.c =================================================================== RCS file: /g/cvslan/linux_2_3/mm/vmscan.c,v retrieving revision 1.1.1.40 diff -u -r1.1.1.40 vmscan.c --- mm/vmscan.c 2000/06/05 03:14:23 1.1.1.40 +++ mm/vmscan.c 2000/06/07 07:32:47 @@ -428,6 +428,31 @@ } /* + * The freemem notifier list holds a list of functions + * that are to be called when trying to free pages. + * + * Call them... We don't use notifier_call_chain + * because the return code from a freemem notifier + * is treated as a shrink_*_memory-style return value. + */ +extern struct notifier_block *freemem_notifier_list; +static int shrink_misc_memory (int priority, unsigned int gfp_mask) +{ + int count = 0; + struct notifier_block *nb = freemem_notifier_list; + + while (nb) { + count += nb->notifier_call(nb, + (unsigned long) priority, + (void *)(unsigned long) gfp_mask); + nb = nb->next; + } + + return count; +} + + +/* * We need to make the locks finer granularity, but right * now we need this so that we can do page allocations * without holding the kernel lock etc. @@ -476,6 +501,13 @@ if (!--count) goto done; } + } + + /* call everybody who registered a mem pressure notifier */ + count -= shrink_misc_memory(priority, gfp_mask); + if (count <= 0) { + ret = 1; + goto done; } /* Index: kernel/ksyms.c =================================================================== RCS file: /g/cvslan/linux_2_3/kernel/ksyms.c,v retrieving revision 1.1.1.62 diff -u -r1.1.1.62 ksyms.c --- kernel/ksyms.c 2000/05/29 23:48:48 1.1.1.62 +++ kernel/ksyms.c 2000/06/07 07:32:53 @@ -448,6 +448,8 @@ EXPORT_SYMBOL(machine_power_off); EXPORT_SYMBOL(register_reboot_notifier); EXPORT_SYMBOL(unregister_reboot_notifier); +EXPORT_SYMBOL(register_freemem_notifier); +EXPORT_SYMBOL(unregister_freemem_notifier); EXPORT_SYMBOL(_ctype); EXPORT_SYMBOL(secure_tcp_sequence_number); EXPORT_SYMBOL(get_random_bytes); Index: kernel/sys.c =================================================================== RCS file: /g/cvslan/linux_2_3/kernel/sys.c,v retrieving revision 1.1.1.19 diff -u -r1.1.1.19 sys.c --- kernel/sys.c 2000/05/31 13:07:05 1.1.1.19 +++ kernel/sys.c 2000/06/07 07:32:53 @@ -47,15 +47,51 @@ */ static struct notifier_block *reboot_notifier_list = NULL; +struct notifier_block *freemem_notifier_list = NULL; +static spinlock_t notifier_lock = SPIN_LOCK_UNLOCKED; int register_reboot_notifier(struct notifier_block * nb) { - return notifier_chain_register(&reboot_notifier_list, nb); + int i; + + spin_lock(¬ifier_lock); + i = notifier_chain_register(&reboot_notifier_list, nb); + spin_unlock(¬ifier_lock); + + return i; } int unregister_reboot_notifier(struct notifier_block * nb) +{ + int i; + + spin_lock(¬ifier_lock); + i = notifier_chain_unregister(&reboot_notifier_list, nb); + spin_unlock(¬ifier_lock); + + return i; +} + +int register_freemem_notifier(struct notifier_block * nb) { - return notifier_chain_unregister(&reboot_notifier_list, nb); + int i; + + spin_lock(¬ifier_lock); + i = notifier_chain_register(&freemem_notifier_list, nb); + spin_unlock(¬ifier_lock); + + return i; +} + +int unregister_freemem_notifier(struct notifier_block * nb) +{ + int i; + + spin_lock(¬ifier_lock); + i = notifier_chain_unregister(&freemem_notifier_list, nb); + spin_unlock(¬ifier_lock); + + return i; } asmlinkage long sys_ni_syscall(void)
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This archive was generated by hypermail 2b29 : Wed Jun 07 2000 - 21:00:27 EST