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nfsd regression since delayed fput()

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Background: nfsd v[23] had throughput regression since delayed fput
went in; every read or write ends up doing fput() and we get a pair
of extra context switches out of that (plus quite a bit of work
in queue_work itselfi, apparently).  Use of schedule_delayed_work()
gives it a chance to accumulate a bit before we do __fput() on all
of them.  I'm not too happy about that solution, but... on at least
one real-world setup it reverts about 10% throughput loss we got from
switch to delayed fput.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2013-10-20 08:44:39 -04:00
parent 43ae9e3fc7
commit c7314d74fc
1 changed files with 2 additions and 2 deletions
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4
fs/file_table.c
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@ -297,7 +297,7 @@ void flush_delayed_fput(void)
delayed_fput(NULL);
}
static DECLARE_WORK(delayed_fput_work, delayed_fput);
static DECLARE_DELAYED_WORK(delayed_fput_work, delayed_fput);
void fput(struct file *file)
{
@ -317,7 +317,7 @@ void fput(struct file *file)
}
if (llist_add(&file->f_u.fu_llist, &delayed_fput_list))
schedule_work(&delayed_fput_work);
schedule_delayed_work(&delayed_fput_work, 1);
}
}