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由 Arnaldo Carvalho de Melo 提交于
perf_counter tools: Add locking to perf top We need to protect the active_symbols list as two threads change it: the main thread adding entries to the head and the display thread decaying entries from any place in the list. Also related: take a snapshot of syme->count[0] before using it to calculate the weight and to show the same number used in this calc when displaying the symbol usage. Reported-by: NMike Galbraith <efault@gmx.de> Tested-by: NMike Galbraith <efault@gmx.de> Signed-off-by: NArnaldo Carvalho de Melo <acme@redhat.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Cc: Steven Rostedt <rostedt@goodmis.org> LKML-Reference: <20090529200307.GR4747@ghostprotocols.net> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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