Imbus/xv6-riscv-kernel
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Only commit log to disk if something was written in to it.

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Without this, every write to the console results in log writes.
This commit is contained in:
Austin Clements 2011-08-15 14:11:22 -04:00
parent 7f1718ca33
commit 843eecfcd0
1 changed files with 7 additions and 5 deletions
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12
log.c
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@ -143,11 +143,13 @@ begin_trans(void)
void void
commit_trans(void) commit_trans(void)
{ {
write_head(); // This causes all blocks till log.head to be commited if (log.lh.n > 0) {
install_trans(); // Install all the transactions till head write_head(); // This causes all blocks till log.head to be commited
log.lh.n = 0; install_trans(); // Install all the transactions till head
write_head(); // Reclaim log log.lh.n = 0;
write_head(); // Reclaim log
}
acquire(&log.lock); acquire(&log.lock);
log.intrans = 0; log.intrans = 0;
wakeup(&log); wakeup(&log);