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readahead: report the original size in BEESTOOLONG

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BEESTOOLONG was always reporting a size of zero, and the offset of the
end of the readahead region.  Report the original size instead (and also
in BEESTRACE and BEESNOTE).

Signed-off-by: Zygo Blaxell <bees@furryterror.org>
This commit is contained in:
Zygo Blaxell
2022-12-30 14:36:55 -05:00
parent 9587c40677
commit c327e0bb10
1 changed files with 8 additions and 6 deletions
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14
src/bees.cc
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@ -215,7 +215,7 @@ BeesTooLong::operator=(const func_type &f)
}
void
bees_readahead(int const fd, off_t offset, size_t size)
bees_readahead(int const fd, const off_t offset, const size_t size)
{
Timer readahead_timer;
BEESNOTE("readahead " << name_fd(fd) << " offset " << to_hex(offset) << " len " << pretty(size));
@ -230,18 +230,20 @@ bees_readahead(int const fd, off_t offset, size_t size)
// and might discard the readahead request entirely,
// so it's maybe, *maybe*, worth doing both.
BEESNOTE("emulating readahead " << name_fd(fd) << " offset " << to_hex(offset) << " len " << pretty(size));
while (size) {
auto working_size = size;
auto working_offset = offset;
while (working_size) {
// don't care about multithreaded writes to this buffer--it is garbage anyway
static uint8_t dummy[BEES_READAHEAD_SIZE];
size_t this_read_size = min(size, sizeof(dummy));
const size_t this_read_size = min(working_size, sizeof(dummy));
// Ignore errors and short reads. It turns out our size
// parameter isn't all that accurate, so we can't use
// the pread_or_die template.
(void)!pread(fd, dummy, this_read_size, offset);
(void)!pread(fd, dummy, this_read_size, working_offset);
BEESCOUNT(readahead_count);
BEESCOUNTADD(readahead_bytes, this_read_size);
offset += this_read_size;
size -= this_read_size;
working_offset += this_read_size;
working_size -= this_read_size;
}
#endif
BEESCOUNTADD(readahead_ms, readahead_timer.age() * 1000);