On Fri, 22 Oct 2010 00:58:14 +0200 Eric Dumazet <eric.dumazet@xxxxxxxxx> wrote: > Then 39 instructions in hot path (no lock taken) Wow, your compiler sucks. .globl __percpu_counter_add .type __percpu_counter_add, @function __percpu_counter_add: pushq %rbp # movq %rsp, %rbp #, pushq %r13 # movq %rdi, %r13 # fbc, fbc pushq %r12 # pushq %rbx # pushq %r10 # movq 96(%rdi), %rbx # <variable>.counters, pcount #APP movl %gs:cpu_number,%eax # cpu_number, pfo_ret__ #NO_APP cltq addq __per_cpu_offset(,%rax,8), %rbx # __per_cpu_offset, pcount movslq (%rbx),%rax #* pcount, tmp70 leaq (%rax,%rsi), %r12 #, count movslq %edx,%rax # batch, batch cmpq %rax, %r12 # batch, count jge .L43 #, negl %edx # batch movslq %edx,%rax # batch, tmp74 cmpq %rax, %r12 # tmp74, count jg .L45 #, .L43: movq %r13, %rdi # fbc, D.14396 call _raw_spin_lock # addq %r12, 72(%r13) # count, <variable>.count movq %r13, %rdi # fbc, D.14396 movl $0, (%rbx) #,* pcount call _raw_spin_unlock # jmp .L47 # .L45: movl %r12d, (%rbx) # count,* pcount .L47: popq %r9 # popq %rbx # popq %r12 # popq %r13 # leave ret -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
