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libbb/copyfd.c: don't mmap a largish buffer if we only want to copy a few kb
function old new delta bb_full_fd_action 283 295 +12 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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@ -22,6 +22,8 @@ static off_t bb_full_fd_action(int src_fd, int dst_fd, off_t size)
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char *buffer;
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char *buffer;
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int buffer_size;
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int buffer_size;
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if (size > 0 && size <= 4 * 1024)
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goto use_small_buf;
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/* We want page-aligned buffer, just in case kernel is clever
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/* We want page-aligned buffer, just in case kernel is clever
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* and can do page-aligned io more efficiently */
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* and can do page-aligned io more efficiently */
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buffer = mmap(NULL, CONFIG_FEATURE_COPYBUF_KB * 1024,
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buffer = mmap(NULL, CONFIG_FEATURE_COPYBUF_KB * 1024,
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@ -30,6 +32,7 @@ static off_t bb_full_fd_action(int src_fd, int dst_fd, off_t size)
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/* ignored: */ -1, 0);
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/* ignored: */ -1, 0);
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buffer_size = CONFIG_FEATURE_COPYBUF_KB * 1024;
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buffer_size = CONFIG_FEATURE_COPYBUF_KB * 1024;
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if (buffer == MAP_FAILED) {
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if (buffer == MAP_FAILED) {
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use_small_buf:
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buffer = alloca(4 * 1024);
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buffer = alloca(4 * 1024);
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buffer_size = 4 * 1024;
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buffer_size = 4 * 1024;
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}
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}
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