From: Vlastimil Babka <vbabka@suse.cz>
To: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>,
linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>,
Michal Hocko <mhocko@suse.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2] mm/kvmalloc: do not call kmalloc for size > KMALLOC_MAX_SIZE
Date: Mon, 5 Nov 2018 14:03:07 +0100 [thread overview]
Message-ID: <80074d2a-2f8d-a9db-892b-105c0ad7cd47@suse.cz> (raw)
In-Reply-To: <154106695670.898059.5301435081426064314.stgit@buzz>
On 11/1/18 11:09 AM, Konstantin Khlebnikov wrote:
> Allocations over KMALLOC_MAX_SIZE could be served only by vmalloc.
>
> Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Makes sense regardless of warnings stuff.
Acked-by: Vlastimil Babka <vbabka@suse.cz>
But it must be moved below the GFP_KERNEL check!
> ---
> mm/util.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/mm/util.c b/mm/util.c
> index 8bf08b5b5760..f5f04fa22814 100644
> --- a/mm/util.c
> +++ b/mm/util.c
> @@ -392,6 +392,9 @@ void *kvmalloc_node(size_t size, gfp_t flags, int node)
> gfp_t kmalloc_flags = flags;
> void *ret;
>
> + if (size > KMALLOC_MAX_SIZE)
> + goto fallback;
> +
> /*
> * vmalloc uses GFP_KERNEL for some internal allocations (e.g page tables)
> * so the given set of flags has to be compatible.
> @@ -422,6 +425,7 @@ void *kvmalloc_node(size_t size, gfp_t flags, int node)
> if (ret || size <= PAGE_SIZE)
> return ret;
>
> +fallback:
> return __vmalloc_node_flags_caller(size, node, flags,
> __builtin_return_address(0));
> }
>
next prev parent reply other threads:[~2018-11-05 13:03 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-01 9:12 [PATCH] mm/kvmalloc: do not confuse kmalloc with page order over MAX_ORDER Konstantin Khlebnikov
2018-11-01 9:33 ` Michal Hocko
2018-11-01 10:09 ` [PATCH 2] mm/kvmalloc: do not call kmalloc for size > KMALLOC_MAX_SIZE Konstantin Khlebnikov
2018-11-01 10:24 ` Michal Hocko
2018-11-01 10:48 ` Konstantin Khlebnikov
2018-11-01 12:55 ` Michal Hocko
2018-11-01 16:42 ` Konstantin Khlebnikov
2018-11-01 16:55 ` Michal Hocko
2018-11-05 13:03 ` Vlastimil Babka [this message]
2018-11-05 16:19 ` Konstantin Khlebnikov
2018-11-05 16:52 ` Vlastimil Babka
2018-11-05 16:57 ` Michal Hocko
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