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author | Dipankar Sarma <dipankar@in.ibm.com> | 2005-09-09 20:04:13 (GMT) |
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committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-09-09 20:57:55 (GMT) |
commit | ab2af1f5005069321c5d130f09cce577b03f43ef (patch) | |
tree | 73a70ba486f522cd9eeeef376ede2b5a1c1b473b /kernel/exit.c | |
parent | 6e72ad2c581de121cc7e772469e2a8f6b1fd4379 (diff) | |
download | linux-fsl-qoriq-ab2af1f5005069321c5d130f09cce577b03f43ef.tar.xz |
[PATCH] files: files struct with RCU
Patch to eliminate struct files_struct.file_lock spinlock on the reader side
and use rcu refcounting rcuref_xxx api for the f_count refcounter. The
updates to the fdtable are done by allocating a new fdtable structure and
setting files->fdt to point to the new structure. The fdtable structure is
protected by RCU thereby allowing lock-free lookup. For fd arrays/sets that
are vmalloced, we use keventd to free them since RCU callbacks can't sleep. A
global list of fdtable to be freed is not scalable, so we use a per-cpu list.
If keventd is already handling the current cpu's work, we use a timer to defer
queueing of that work.
Since the last publication, this patch has been re-written to avoid using
explicit memory barriers and use rcu_assign_pointer(), rcu_dereference()
premitives instead. This required that the fd information is kept in a
separate structure (fdtable) and updated atomically.
Signed-off-by: Dipankar Sarma <dipankar@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel/exit.c')
-rw-r--r-- | kernel/exit.c | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/kernel/exit.c b/kernel/exit.c index 83beb1e..6d2089a 100644 --- a/kernel/exit.c +++ b/kernel/exit.c @@ -411,15 +411,16 @@ void fastcall put_files_struct(struct files_struct *files) close_files(files); /* * Free the fd and fdset arrays if we expanded them. + * If the fdtable was embedded, pass files for freeing + * at the end of the RCU grace period. Otherwise, + * you can free files immediately. */ fdt = files_fdtable(files); - if (fdt->fd != &files->fd_array[0]) - free_fd_array(fdt->fd, fdt->max_fds); - if (fdt->max_fdset > __FD_SETSIZE) { - free_fdset(fdt->open_fds, fdt->max_fdset); - free_fdset(fdt->close_on_exec, fdt->max_fdset); - } - kmem_cache_free(files_cachep, files); + if (fdt == &files->fdtab) + fdt->free_files = files; + else + kmem_cache_free(files_cachep, files); + free_fdtable(fdt); } } |