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Add comments about stack protection mechanism.

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This commit is contained in:
Alexander Motin 2008-02-01 11:01:15 +00:00
parent b1a3358ba3
commit d4529f987a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=175868
1 changed files with 8 additions and 0 deletions
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8
sys/netgraph/ng_base.c
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@ -2372,6 +2372,14 @@ ng_snd_item(item_p item, int flags)
}
#ifdef GET_STACK_USAGE
else {
/*
* Most of netgraph nodes has small stack consumption and
* for them it is more then enogh 20% of free stack.
* Nodes/hooks with higher stack usage should be marked as
* HI_STACK. For them 50% of stack will be guarantied.
* XXX: Values 50% (64/128) and 80% (100/128) are completely
* empirical.
*/
size_t st, su;
GET_STACK_USAGE(st, su);
su = (su * 128) / st;