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Generalize ExtractSymbols optimization (pprof).

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Generalize ExtractSymbols to handle all cases of library address overlap
with the main binary.
This commit is contained in:
Jason Evans 2010-04-08 23:23:53 -07:00
parent 799ca0b68d
commit 5fe764f83f
1 changed files with 18 additions and 17 deletions
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25
jemalloc/bin/pprof
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@ -3114,22 +3114,18 @@ sub ReadHeapProfile {
# The sampling frequency is the rate of a Poisson process.
# This means that the probability of sampling an allocation of
# size X with sampling rate Y is 1 - exp(-X/Y)
if ($n1 != 0) {
my $ratio;
$ratio = (($s1*1.0)/$n1)/($sample_adjustment);
my $scale_factor;
if ($n1 != 0) {
$ratio = (($s1*1.0)/$n1)/($sample_adjustment);
$scale_factor = 1/(1 - exp(-$ratio));
$n1 *= $scale_factor;
$s1 *= $scale_factor;
}
if ($n2 != 0) {
my $ratio;
$ratio = (($s2*1.0)/$n2)/($sample_adjustment);
my $scale_factor;
$scale_factor = 1/(1 - exp(-$ratio));
$n2 *= $scale_factor;
$s2 *= $scale_factor;
}
} else {
# Remote-heap version 1
my $ratio;
@ -3682,8 +3678,6 @@ sub ExtractSymbols {
# Map each PC value to the containing library
my @pcs = (sort { $a cmp $b } keys(%{$pcset}));
my $pc = pop(@pcs);
foreach my $lib (reverse sort {$a->[1] cmp $b->[1]} @{$libs}) {
my $libname = $lib->[0];
my $start = $lib->[1];
@ -3691,17 +3685,24 @@ sub ExtractSymbols {
my $offset = $lib->[3];
# Get list of pcs that belong in this library.
my $pc = pop(@pcs);
my @pcs2 = ();
my $contained = [];
while (($pc ge $start) && ($pc le $finish)) {
while (defined $pc && $pc gt $finish) {
unshift(@pcs2, $pc);
$pc = pop(@pcs);
}
while (defined $pc && $pc ge $start) {
push(@{$contained}, $pc);
$pc = pop(@pcs);
if (!defined $pc) {
last;
}
if (defined $pc) {
push(@pcs, $pc);
}
@pcs = (@pcs, @pcs2);
# Map to symbols
MapToSymbols($libname, AddressSub($start, $offset), $contained, $symbols);
if (!defined $pc) {
if (scalar(@pcs) == 0) {
last;
}
}