it seems from what I see in mm/filemap.c that write() is now implemented
as copy-on-write (ie if user-space leaves alone the buffer after the
write(), data is sent direct to device with no copy_from_user()).
That's nice. However, how can I be sure from user space that the operation
completed and it's ok *performance-wise* to reuse the page ?
while (TRUE) {
if (buffer_1_finished()) {
/* generate data in buffer1 */
write(fd, buffer1, size);
}
if (buffer_2_finished()) {
/* generate data in buffer2 */
write(fd, buffer2, size);
}
}
What is the condition buffer_1_finished() ?
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