Hi, Thank you. I have found the main reason for my problem. alloc_bootmem() must use after init_bootmem_node() and before free_all_bootmem(), but profile_init() is executed after free_all_bootmem(), so it could not alloc the memory what I want.
2011/4/15 Dave Hylands <[email protected]> > Hi, > > On Thu, Apr 14, 2011 at 10:49 PM, javaweb zhang <[email protected]> > wrote: > > Hello, everyone. I use alloc_bootmem() in profile.c to allocate a big > memory > > at function profile_init(), how I know whether it is success? The > following > > is my code: > > // at kernel/profile.c > > ctxsw_A = (struct ctxsw_rec *)alloc_bootmem(sizeof(struct > ctxsw_rec)*CTXSW); > > ctxsw_rec is a struct which declared in include/linux/profile.h, CTXSW = > > 4>>10 > > Looking at the source code for alloc_bootmem, it returns a NULL > pointer (which is what most allocators do when the allocation fails). > It appears that it will hit a panic first though, so you may never get > to the receiving the NULL. > > -- > Dave Hylands > Shuswap, BC, Canada > http://www.davehylands.com >
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