From: Vlastimil Babka <vbabka@suse.cz>
To: Mel Gorman <mgorman@techsingularity.net>
Cc: Andrew Morton <akpm@linux-foundation.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
linux-api@vger.kernel.org, Roman Gushchin <guro@fb.com>,
Michal Hocko <mhocko@kernel.org>,
Johannes Weiner <hannes@cmpxchg.org>,
Christoph Lameter <cl@linux.com>,
David Rientjes <rientjes@google.com>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
Matthew Wilcox <willy@infradead.org>
Subject: Re: [PATCH v3 2/7] mm, slab/slub: introduce kmalloc-reclaimable caches
Date: Fri, 20 Jul 2018 11:32:28 +0200 [thread overview]
Message-ID: <6981b5a7-470c-ab1d-99dd-23304d81358a@suse.cz> (raw)
In-Reply-To: <20180719082319.6jkltwinon3pyzyn@techsingularity.net>
On 07/19/2018 10:23 AM, Mel Gorman wrote:
>> /*
>> diff --git a/mm/slab_common.c b/mm/slab_common.c
>> index 4614248ca381..614fb7ab8312 100644
>> --- a/mm/slab_common.c
>> +++ b/mm/slab_common.c
>> @@ -1107,10 +1107,21 @@ void __init setup_kmalloc_cache_index_table(void)
>> }
>> }
>>
>> -static void __init new_kmalloc_cache(int idx, slab_flags_t flags)
>> +static void __init
>> +new_kmalloc_cache(int idx, int type, slab_flags_t flags)
>> {
>> - kmalloc_caches[KMALLOC_NORMAL][idx] = create_kmalloc_cache(
>> - kmalloc_info[idx].name,
>> + const char *name;
>> +
>> + if (type == KMALLOC_RECLAIM) {
>> + flags |= SLAB_RECLAIM_ACCOUNT;
>> + name = kasprintf(GFP_NOWAIT, "kmalloc-rcl-%u",
>> + kmalloc_info[idx].size);
>> + BUG_ON(!name);
>> + } else {
>> + name = kmalloc_info[idx].name;
>> + }
>> +
>> + kmalloc_caches[type][idx] = create_kmalloc_cache(name,
>> kmalloc_info[idx].size, flags, 0,
>> kmalloc_info[idx].size);
>> }
>
> I was going to query that BUG_ON but if I'm reading it right, we just
> have to be careful in the future that the "normal" kmalloc cache is always
> initialised before the reclaimable cache or there will be issues.
Yeah, I was just copying how the dma-kmalloc code does it.
>> @@ -1122,22 +1133,25 @@ static void __init new_kmalloc_cache(int idx, slab_flags_t flags)
>> */
>> void __init create_kmalloc_caches(slab_flags_t flags)
>> {
>> - int i;
>> - int type = KMALLOC_NORMAL;
>> + int i, type;
>>
>> - for (i = KMALLOC_SHIFT_LOW; i <= KMALLOC_SHIFT_HIGH; i++) {
>> - if (!kmalloc_caches[type][i])
>> - new_kmalloc_cache(i, flags);
>> + for (type = KMALLOC_NORMAL; type <= KMALLOC_RECLAIM; type++) {
>> + for (i = KMALLOC_SHIFT_LOW; i <= KMALLOC_SHIFT_HIGH; i++) {
>> + if (!kmalloc_caches[type][i])
>> + new_kmalloc_cache(i, type, flags);
>>
>
> I don't see a problem here as such but the values of the KMALLOC_* types
> is important both for this function and the kmalloc_type(). It might be
> worth adding a warning that these functions be examined if updating the
> types but then again, anyone trying and getting it wrong will have a
> broken kernel so;
OK
> Acked-by: Mel Gorman <mgorman@techsingularity.net>
Thanks!
next prev parent reply other threads:[~2018-07-20 9:34 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-18 13:36 [PATCH v3 0/7] kmalloc-reclaimable caches Vlastimil Babka
2018-07-18 13:36 ` [PATCH v3 1/7] mm, slab: combine kmalloc_caches and kmalloc_dma_caches Vlastimil Babka
2018-07-19 8:10 ` Mel Gorman
2018-07-20 9:30 ` Vlastimil Babka
2018-07-30 15:38 ` Christopher Lameter
2018-07-18 13:36 ` [PATCH v3 2/7] mm, slab/slub: introduce kmalloc-reclaimable caches Vlastimil Babka
2018-07-19 8:23 ` Mel Gorman
2018-07-20 9:32 ` Vlastimil Babka [this message]
2018-07-19 18:16 ` Roman Gushchin
2018-07-20 9:35 ` Vlastimil Babka
2018-07-30 15:41 ` Christopher Lameter
2018-07-18 13:36 ` [PATCH v3 3/7] mm, slab: allocate off-slab freelists as reclaimable when appropriate Vlastimil Babka
2018-07-19 8:35 ` Mel Gorman
2018-07-20 9:37 ` Vlastimil Babka
2018-07-30 15:45 ` Christopher Lameter
2018-07-18 13:36 ` [PATCH v3 4/7] dcache: allocate external names from reclaimable kmalloc caches Vlastimil Babka
2018-07-19 8:42 ` Mel Gorman
2018-07-18 13:36 ` [PATCH v3 5/7] mm: rename and change semantics of nr_indirectly_reclaimable_bytes Vlastimil Babka
2018-07-30 15:46 ` Christopher Lameter
2018-07-18 13:36 ` [PATCH v3 6/7] mm, proc: add KReclaimable to /proc/meminfo Vlastimil Babka
2018-07-18 13:36 ` [PATCH v3 7/7] mm, slab: shorten kmalloc cache names for large sizes Vlastimil Babka
2018-07-19 8:46 ` Mel Gorman
2018-07-30 15:48 ` Christopher Lameter
2018-07-31 8:55 ` Vlastimil Babka
2018-07-19 19:53 ` [PATCH v3 0/7] kmalloc-reclaimable caches Roman Gushchin
2018-07-20 9:45 ` Vlastimil Babka
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