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perf hist: Only allocate callchain_node if processing callchains

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The struct callchain_node size is 120 bytes, that are never used when
there are no callchains or '-g none' is specified, so conditionally
allocate it, reducing sizeof(struct hist_entry) from 210 bytes to only
96, greatly speeding the non-callchain processing.

LKML-Reference: <new-submission>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo
2010-04-02 09:50:42 -03:00
parent 71cf8b8ff7
commit b9fb930477
3 changed files with 6 additions and 5 deletions
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2
tools/perf/util/sort.h
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@ -49,12 +49,12 @@ struct hist_entry {
u64 ip;
char level;
struct symbol *parent;
struct callchain_node callchain;
union {
unsigned long position;
struct hist_entry *pair;
struct rb_root sorted_chain;
};
struct callchain_node callchain[0];
};
enum sort_type {