From: Shakeel Butt <shakeelb@google.com> To: Michal Hocko <mhocko@kernel.org> Cc: Andrew Morton <akpm@linux-foundation.org>, Linux MM <linux-mm@kvack.org>, LKML <linux-kernel@vger.kernel.org>, Michal Hocko <mhocko@suse.com>, Eric Dumazet <edumazet@google.com>, Vlastimil Babka <vbabka@suse.cz> Subject: Re: [PATCH 7/9] net: use kvmalloc with __GFP_REPEAT rather than open coded variant Date: Thu, 30 Mar 2017 16:21:43 -0700 [thread overview] Message-ID: <CALvZod73-ddnbMAWXF9QpXMcpjZMLreLXheUo-CgcB7s_5iBnQ@mail.gmail.com> (raw) In-Reply-To: <20170306103327.2766-3-mhocko@kernel.org> On Mon, Mar 6, 2017 at 2:33 AM, Michal Hocko <mhocko@kernel.org> wrote: > From: Michal Hocko <mhocko@suse.com> > > fq_alloc_node, alloc_netdev_mqs and netif_alloc* open code kmalloc > with vmalloc fallback. Use the kvmalloc variant instead. Keep the > __GFP_REPEAT flag based on explanation from Eric: > " > At the time, tests on the hardware I had in my labs showed that > vmalloc() could deliver pages spread all over the memory and that was a > small penalty (once memory is fragmented enough, not at boot time) > " > > The way how the code is constructed means, however, that we prefer to go > and hit the OOM killer before we fall back to the vmalloc for requests > <=32kB (with 4kB pages) in the current code. This is rather disruptive for > something that can be achived with the fallback. On the other hand > __GFP_REPEAT doesn't have any useful semantic for these requests. So the > effect of this patch is that requests smaller than 64kB will fallback to I am a bit confused about this 64kB, shouldn't it be <=32kB (with 4kB pages & PAGE_ALLOC_COSTLY_ORDER = 3)? > vmalloc easier now. > > Cc: Eric Dumazet <edumazet@google.com> > Cc: netdev@vger.kernel.org > Acked-by: Vlastimil Babka <vbabka@suse.cz> > Signed-off-by: Michal Hocko <mhocko@suse.com> > ---
WARNING: multiple messages have this Message-ID (diff)
From: Shakeel Butt <shakeelb@google.com> To: Michal Hocko <mhocko@kernel.org> Cc: Andrew Morton <akpm@linux-foundation.org>, Linux MM <linux-mm@kvack.org>, LKML <linux-kernel@vger.kernel.org>, Michal Hocko <mhocko@suse.com>, Eric Dumazet <edumazet@google.com>, Vlastimil Babka <vbabka@suse.cz> Subject: Re: [PATCH 7/9] net: use kvmalloc with __GFP_REPEAT rather than open coded variant Date: Thu, 30 Mar 2017 16:21:43 -0700 [thread overview] Message-ID: <CALvZod73-ddnbMAWXF9QpXMcpjZMLreLXheUo-CgcB7s_5iBnQ@mail.gmail.com> (raw) In-Reply-To: <20170306103327.2766-3-mhocko@kernel.org> On Mon, Mar 6, 2017 at 2:33 AM, Michal Hocko <mhocko@kernel.org> wrote: > From: Michal Hocko <mhocko@suse.com> > > fq_alloc_node, alloc_netdev_mqs and netif_alloc* open code kmalloc > with vmalloc fallback. Use the kvmalloc variant instead. Keep the > __GFP_REPEAT flag based on explanation from Eric: > " > At the time, tests on the hardware I had in my labs showed that > vmalloc() could deliver pages spread all over the memory and that was a > small penalty (once memory is fragmented enough, not at boot time) > " > > The way how the code is constructed means, however, that we prefer to go > and hit the OOM killer before we fall back to the vmalloc for requests > <=32kB (with 4kB pages) in the current code. This is rather disruptive for > something that can be achived with the fallback. On the other hand > __GFP_REPEAT doesn't have any useful semantic for these requests. So the > effect of this patch is that requests smaller than 64kB will fallback to I am a bit confused about this 64kB, shouldn't it be <=32kB (with 4kB pages & PAGE_ALLOC_COSTLY_ORDER = 3)? > vmalloc easier now. > > Cc: Eric Dumazet <edumazet@google.com> > Cc: netdev@vger.kernel.org > Acked-by: Vlastimil Babka <vbabka@suse.cz> > Signed-off-by: Michal Hocko <mhocko@suse.com> > --- -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2017-03-30 23:22 UTC|newest] Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-03-06 10:30 [PATCH 0/6 v5] kvmalloc Michal Hocko 2017-03-06 10:30 ` Michal Hocko 2017-03-06 10:30 ` [PATCH 1/9] mm: introduce kv[mz]alloc helpers Michal Hocko 2017-03-06 10:30 ` Michal Hocko 2017-06-02 7:17 ` Levin, Alexander (Sasha Levin) 2017-06-02 7:17 ` Levin, Alexander (Sasha Levin) 2017-06-02 7:28 ` Michal Hocko 2017-06-02 7:28 ` Michal Hocko 2017-06-02 7:40 ` Levin, Alexander (Sasha Levin) 2017-06-02 7:40 ` Levin, Alexander (Sasha Levin) 2017-06-02 7:50 ` Michal Hocko 2017-06-02 7:50 ` Michal Hocko 2017-03-06 10:30 ` [PATCH 2/9] mm: support __GFP_REPEAT in kvmalloc_node for >32kB Michal Hocko 2017-03-06 10:30 ` Michal Hocko 2017-04-07 0:45 ` Shakeel Butt 2017-04-07 0:45 ` Shakeel Butt 2017-04-07 7:40 ` Michal Hocko 2017-04-07 7:40 ` Michal Hocko 2017-03-06 10:30 ` [PATCH 3/9] rhashtable: simplify a strange allocation pattern Michal Hocko 2017-03-06 10:30 ` Michal Hocko 2017-03-06 10:30 ` [PATCH 4/9] ila: " Michal Hocko 2017-03-06 10:30 ` Michal Hocko 2017-03-06 10:33 ` [PATCH 5/9] xattr: zero out memory copied to userspace in getxattr Michal Hocko 2017-03-06 10:33 ` Michal Hocko 2017-03-06 10:33 ` [PATCH 6/9] treewide: use kv[mz]alloc* rather than opencoded variants Michal Hocko 2017-03-06 10:33 ` Michal Hocko 2017-03-06 10:33 ` [PATCH 7/9] net: use kvmalloc with __GFP_REPEAT rather than open coded variant Michal Hocko 2017-03-06 10:33 ` Michal Hocko 2017-03-30 23:21 ` Shakeel Butt [this message] 2017-03-30 23:21 ` Shakeel Butt 2017-03-31 8:46 ` Michal Hocko 2017-03-31 8:46 ` Michal Hocko 2017-03-06 10:33 ` [PATCH 8/9] md: use kvmalloc rather than opencoded variant Michal Hocko 2017-03-06 10:33 ` Michal Hocko 2017-03-06 10:33 ` [PATCH 9/9] bcache: use kvmalloc Michal Hocko 2017-03-06 10:33 ` Michal Hocko
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