1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-07-25 18:17:44 +00:00

Kernel: Implement O_DIRECT open() flag to bypass disk caches

Files opened with O_DIRECT will now bypass the disk cache in read/write
operations (though metadata operations will still hit the disk cache.)

This will allow us to test actual disk performance instead of testing
disk *cache* performance, if that's what we want. :^)

There's room for improvment here, we're very aggressively flushing any
dirty cache entries for the specific block before reading/writing that
block. This is done by walking the entire cache, which may be slow.
This commit is contained in:
Andreas Kling 2019-11-05 19:35:12 +01:00
parent 3de3daf765
commit 59ed235c85
7 changed files with 59 additions and 18 deletions

View file

@ -293,6 +293,7 @@ void FileDescription::set_file_flags(u32 flags)
{
m_is_blocking = !(flags & O_NONBLOCK);
m_should_append = flags & O_APPEND;
m_direct = flags & O_DIRECT;
m_file_flags = flags;
}