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    [PATCH] knfsd: reduce stack consumption · 9f708e40
    Neil Brown 提交于
    A typical nfsd call trace is
     nfsd -> svc_process -> nfsd_dispatch -> nfsd3_proc_write ->
       nfsd_write ->nfsd_vfs_write -> vfs_writev
    
    These add up to over 300 bytes on the stack.
    Looking at each of these, I see that nfsd_write (which includes
     nfsd_vfs_write) contributes 0x8c to stack usage itself!!
    
    It turns out this is because it puts a 'struct iattr' on the stack so
    it can kill suid if needed.  The following patch saves about 50 bytes
    off the stack in this call path.
    Signed-off-by: NNeil Brown <neilb@suse.de>
    Signed-off-by: NAndrew Morton <akpm@osdl.org>
    Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
    9f708e40
vfs.c 45.7 KB