• A
    perf tools: Consolidate symbol resolving across all tools · 1ed091c4
    Arnaldo Carvalho de Melo 提交于
    Now we have a very high level routine for simple tools to
    process IP sample events:
    
    	int event__preprocess_sample(const event_t *self,
    				     struct addr_location *al,
    				     symbol_filter_t filter)
    
    It receives the event itself and will insert new threads in the
    global threads list and resolve the map and symbol, filling all
    this info into the new addr_location struct, so that tools like
    annotate and report can further process the event by creating
    hist_entries in their specific way (with or without callgraphs,
    etc).
    
    It in turn uses the new next layer function:
    
    	void thread__find_addr_location(struct thread *self, u8 cpumode,
    					enum map_type type, u64 addr,
    					struct addr_location *al,
    					symbol_filter_t filter)
    
    This one will, given a thread (userspace or the kernel kthread
    one), will find the given type (MAP__FUNCTION now, MAP__VARIABLE
    too in the near future) at the given cpumode, taking vdsos into
    account (userspace hit, but kernel symbol) and will fill all
    these details in the addr_location given.
    
    Tools that need a more compact API for plain function
    resolution, like 'kmem', can use this other one:
    
    	struct symbol *thread__find_function(struct thread *self, u64 addr,
    					     symbol_filter_t filter)
    
    So, to resolve a kernel symbol, that is all the 'kmem' tool
    needs, its just a matter of calling:
    
    	sym = thread__find_function(kthread, addr, NULL);
    
    The 'filter' parameter is needed because we do lazy
    parsing/loading of ELF symtabs or /proc/kallsyms.
    
    With this we remove more code duplication all around, which is
    always good, huh? :-)
    Signed-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
    Cc: Frédéric Weisbecker <fweisbec@gmail.com>
    Cc: John Kacur <jkacur@redhat.com>
    Cc: Mike Galbraith <efault@gmx.de>
    Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
    Cc: Paul Mackerras <paulus@samba.org>
    LKML-Reference: <1259346563-12568-12-git-send-email-acme@infradead.org>
    Signed-off-by: NIngo Molnar <mingo@elte.hu>
    1ed091c4
symbol.h 2.8 KB