From: Johannes Weiner <hannes@cmpxchg.org>
To: js1304@gmail.com
Cc: Andrew Morton <akpm@linux-foundation.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Michal Hocko <mhocko@kernel.org>, Hugh Dickins <hughd@google.com>,
Minchan Kim <minchan@kernel.org>,
Vlastimil Babka <vbabka@suse.cz>,
Mel Gorman <mgorman@techsingularity.net>,
kernel-team@lge.com, Joonsoo Kim <iamjoonsoo.kim@lge.com>
Subject: Re: [PATCH v3 4/9] mm/swapcache: support to handle the value in swapcache
Date: Wed, 18 Mar 2020 14:33:18 -0400 [thread overview]
Message-ID: <20200318183318.GD154135@cmpxchg.org> (raw)
In-Reply-To: <1584423717-3440-5-git-send-email-iamjoonsoo.kim@lge.com>
On Tue, Mar 17, 2020 at 02:41:52PM +0900, js1304@gmail.com wrote:
> From: Joonsoo Kim <iamjoonsoo.kim@lge.com>
>
> Swapcache doesn't handle the value since there is no case using the value.
> In the following patch, workingset detection for anonymous page will be
> implemented and it stores the value into the swapcache. So, we need to
> handle it and this patch implement handling.
"value" is too generic, it's not quite clear what this refers to
here. "Exceptional entries" or "shadow entries" would be better.
> @@ -155,24 +163,33 @@ int add_to_swap_cache(struct page *page, swp_entry_t entry, gfp_t gfp)
> * This must be called only on pages that have
> * been verified to be in the swap cache.
> */
> -void __delete_from_swap_cache(struct page *page, swp_entry_t entry)
> +void __delete_from_swap_cache(struct page *page,
> + swp_entry_t entry, void *shadow)
> {
> struct address_space *address_space = swap_address_space(entry);
> int i, nr = hpage_nr_pages(page);
> pgoff_t idx = swp_offset(entry);
> XA_STATE(xas, &address_space->i_pages, idx);
>
> + /* Do not apply workingset detection for the hugh page */
> + if (nr > 1)
> + shadow = NULL;
Hm, why is that? Should that be an XXX/TODO item? The comment should
explain the reason, not necessarily what the code is doing.
Also, s/hugh/huge/
The rest of the patch looks straight-forward to me.
next prev parent reply other threads:[~2020-03-18 18:33 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-17 5:41 [PATCH v3 0/9] workingset protection/detection on the anonymous LRU list js1304
2020-03-17 5:41 ` [PATCH v3 1/9] mm/vmscan: make active/inactive ratio as 1:1 for anon lru js1304
2020-03-18 17:45 ` Johannes Weiner
2020-03-17 5:41 ` [PATCH v3 2/9] mm/vmscan: protect the workingset on anonymous LRU js1304
2020-03-18 17:51 ` Johannes Weiner
2020-03-19 4:01 ` Joonsoo Kim
2020-03-17 5:41 ` [PATCH v3 3/9] mm/workingset: extend the workingset detection for anon LRU js1304
2020-03-18 18:06 ` Johannes Weiner
2020-03-19 4:13 ` Joonsoo Kim
2020-03-17 5:41 ` [PATCH v3 4/9] mm/swapcache: support to handle the value in swapcache js1304
2020-03-18 18:33 ` Johannes Weiner [this message]
2020-03-19 6:01 ` Joonsoo Kim
2020-03-17 5:41 ` [PATCH v3 5/9] mm/workingset: use the node counter if memcg is the root memcg js1304
2020-03-18 19:18 ` Johannes Weiner
2020-03-19 6:20 ` Joonsoo Kim
2020-03-17 5:41 ` [PATCH v3 6/9] mm/workingset: handle the page without memcg js1304
2020-03-18 19:59 ` Johannes Weiner
2020-03-19 8:31 ` Joonsoo Kim
2020-03-17 5:41 ` [PATCH v3 7/9] mm/swap: implement workingset detection for anonymous LRU js1304
2020-03-17 5:41 ` [PATCH v3 8/9] mm/vmscan: restore active/inactive ratio " js1304
2020-03-17 5:41 ` [PATCH v3 9/9] mm/swap: count a new anonymous page as a reclaim_state's rotate js1304
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