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| author | Zbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl> | 2016-03-14 20:15:21 -0400 |
|---|---|---|
| committer | Zbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl> | 2016-03-15 14:54:27 -0400 |
| commit | 00a8cf7763ec5e132efd4c974fbc6530c82240d0 (patch) | |
| tree | f03f8725f75ac6cce03f4b073adb04e2ee522998 /hwdb/20-sdio-classes.hwdb | |
| parent | ce33fddad0806f859ff7324527ee0525dd10455e (diff) | |
basic/copy: use sendfile smarter
We called sendfile with 16kb (a.k.a. COPY_BUFFER_SIZE) as the maximum
number of bytes to copy. This seems rather inefficient, especially with
large files. Instead, call sendfile with a "large" maximum.
What "large" max means is a bit tricky: current file offset + max
must fit in loff_t. This means that as we call sendfile more than once,
we have to lower the max size.
With this patch, test-copy calls sendfile twice, e.g.:
sendfile(4, 3, NULL, 9223372036854775807) = 738760
sendfile(4, 3, NULL, 9223372036854037047) = 0
The second call is necessary to determine EOF.
Diffstat (limited to 'hwdb/20-sdio-classes.hwdb')
0 files changed, 0 insertions, 0 deletions