Hello Sergey,
On Fri, May 13, 2016 at 05:06:43PM +0900, Sergey Senozhatsky wrote:
> On (05/13/16 16:20), Minchan Kim wrote:
> > > > > @@ -737,12 +737,12 @@ static int zram_bvec_write(struct zram *zram, struct bio_vec *bvec, u32 index,
> > > > > zcomp_strm_release(zram->comp, zstrm);
> > > > > zstrm = NULL;
> > > > >
> > > > > - atomic64_inc(&zram->stats.num_recompress);
> > > > > -
> > > > > handle = zs_malloc(meta->mem_pool, clen,
> > > > > GFP_NOIO | __GFP_HIGHMEM);
> > > > > - if (handle)
> > > > > + if (handle) {
> > > > > + atomic64_inc(&zram->stats.num_recompress);
> > > > > goto compress_again;
> > > > > + }
>
>
> just a small note:
>
> > Although 2 is smaller, your patch just accounts only direct reclaim but my
> > suggestion can count both 1 and 2 so isn't it better?
>
> no, my patch accounts 1) and 2) as well. the only difference is that my
> patch accounts second zs_malloc() call _EVEN_ if it has failed and we
> jumped to goto err (because we still could have done reclaim). the new
> version would account second zs_malloc() _ONLY_ if it has succeeded, and
> thus possibly reclaim would not be accounted.
>
>
> recompress:
> compress
> handle = zs_malloc FAST PATH
>
> if (!handle) {
> release stream
> handle = zs_malloc SLOW PATH
>
> << my patch accounts SLOW PATH here >>
>
> if (handle) {
> num_recompress++ << NEW version accounts it here, only it was OK >>
> goto recompress;
> }
>
> goto err; << SLOW PATH is not accounted if SLOW PATH was unsuccessful
> }
>
I got your point. You want to account every slow path and change
the naming from num_recompress to something to show that slow path.
Sorry for catching your point too late. And I absolutely agree with you.
I want to name it with 'writestall' like MM's allocstall. :)
Now I saw you sent new version but I like your suggestion more.
I will send new verion by hand :)
Thanks for the arguing. It was worth!
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