On Thu, 11 Nov 2010 15:14:19 +0300, Dmitry Monakhov <dmonakhov@xxxxxxxxxx> wrote:
Ping. Jan can you please take a look at the series.
> This patch set is my attempt to make quota code more scalable.
> Main goal of this patch-set is to split global locking to per-sb basis.
> Actually it consists of several parts
> * Fixes : trivial fixes which i hope will be accepted w/o any complain
> * Splitup global locks: Imho this part clean and simple. I hope it is
> also a sane candidate for for_testing branch.
> * More scalability for single sb : Some of this patches was already
> submitted previously, some wasn't. This part is just my first vision
> of the way we can move. This way result in real speedup, but i'm not
> shure about design solutions, please do not punch me too strong
> if you dont like that direction.
>
> This patch-set survived after some stress testing
> * parallel quota{on,off}
> * fssress
> * triggering ENOSPC
>
> More info here: download.openvz.org/~dmonakhov/quota.html
>
> Changes from V2
> * Move getfmt call to dquot (suggested by hch@)
> * Use global hash with per backet lock (suggested by viro@)
> * Protect dqget with SRCU to prevent race on quota_info ptr
> * Add dquot_init optimization
> * Remove data_lock for ocfs2 where possible.
> * I've remove dq_count optimization patch because it was buggy,
> and in fact it should belongs to another patch-set.
> * Bug fixes
> ** Fix deadlock on dquot transfer due to previous ENOSPC
>
> Changes from V1
> * random fixes according to Jan's comments
> + fix spelling
> + fix deadlock on dquot_transfer, and lock_dep issues
> - list_lock patches split is still the same as before.
> * move quota data from sb to dedicated pointer.
> * Basic improvements fore per-sb scalability
>
> patch against 2.6.36-rc5, linux-fs-2.6.git for_testing branch
> <Out of tree patches from other developers>
> kernel: add bl_list
> <Cleanups and Fixes>
> quota: protect getfmt call with dqonoff_mutex lock
> quota: Wrap common expression to helper function
> <Split-up global locks>
> quota: protect dqget() from parallels quotaoff via SRCU
> quota: mode quota internals from sb to quota_info
> quota: Remove state_lock
> quota: add quota format lock
> quota: make dquot lists per-sb
> quota: optimize quota_initialize
> quota: user per-backet hlist lock for dquot_hash
> quota: remove global dq_list_lock
> <More scalability for single sb>
> quota: rename dq_lock
> quota: make per-sb dq_data_lock
> quota: protect dquot mem info with object's lock
> quota: drop dq_data_lock where possible
> quota: relax dq_data_lock dq_lock locking consistency
> quota: Some stylistic cleanup for dquot interface
> fs: add unlocked helpers
> quota: protect i_dquot with i_lock instead of dqptr_sem
>
> Signed-off-by: Dmitry Monakhov <dmonakhov@xxxxxxxxxx>
> ---
> Makefile | 2 +-
> 1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/Makefile b/Makefile
> index 471c49f..4e7602b 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -1,7 +1,7 @@
> VERSION = 2
> PATCHLEVEL = 6
> SUBLEVEL = 36
> -EXTRAVERSION = -rc6
> +EXTRAVERSION = -rc6-quota
> NAME = Sheep on Meth
>
> # *DOCUMENTATION*
> --
> 1.6.5.2
>
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