From: David Rientjes <rientjes@google.com>
To: Vlastimil Babka <vbabka@suse.cz>
Cc: Shaohua Li <shli@fb.com>,
netdev@vger.kernel.org, davem@davemloft.net, Kernel-team@fb.com,
clm@fb.com, linux-mm@kvack.org, dbavatar@gmail.com,
Eric Dumazet <edumazet@google.com>
Subject: Re: [RFC V3] net: don't wait for order-3 page allocation
Date: Wed, 17 Jun 2015 16:02:59 -0700 (PDT) [thread overview]
Message-ID: <alpine.DEB.2.10.1506171602300.8203@chino.kir.corp.google.com> (raw)
In-Reply-To: <557AA834.8070503@suse.cz>
On Fri, 12 Jun 2015, Vlastimil Babka wrote:
> > diff --git a/net/core/skbuff.c b/net/core/skbuff.c
> > index 3cfff2a..41ec022 100644
> > --- a/net/core/skbuff.c
> > +++ b/net/core/skbuff.c
> > @@ -4398,7 +4398,7 @@ struct sk_buff *alloc_skb_with_frags(unsigned long
> > header_len,
> >
> > while (order) {
> > if (npages >= 1 << order) {
> > - page = alloc_pages(gfp_mask |
> > + page = alloc_pages((gfp_mask & ~__GFP_WAIT) |
> > __GFP_COMP |
> > __GFP_NOWARN |
> > __GFP_NORETRY,
>
> Note that __GFP_NORETRY is weaker than ~__GFP_WAIT and thus redundant. But it
> won't hurt anything leaving it there. And you might consider __GFP_NO_KSWAPD
> instead, as I said in the other thread.
>
Yeah, I agreed with __GFP_NO_KSWAPD to avoid utilizing memory reserves for
this.
> > diff --git a/net/core/sock.c b/net/core/sock.c
> > index 292f422..e9855a4 100644
> > --- a/net/core/sock.c
> > +++ b/net/core/sock.c
> > @@ -1883,7 +1883,7 @@ bool skb_page_frag_refill(unsigned int sz, struct
> > page_frag *pfrag, gfp_t gfp)
> >
> > pfrag->offset = 0;
> > if (SKB_FRAG_PAGE_ORDER) {
> > - pfrag->page = alloc_pages(gfp | __GFP_COMP |
> > + pfrag->page = alloc_pages((gfp & ~__GFP_WAIT) | __GFP_COMP |
> > __GFP_NOWARN | __GFP_NORETRY,
> > SKB_FRAG_PAGE_ORDER);
> > if (likely(pfrag->page)) {
> >
--
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WARNING: multiple messages have this Message-ID (diff)
From: David Rientjes <rientjes@google.com>
To: Vlastimil Babka <vbabka@suse.cz>
Cc: Shaohua Li <shli@fb.com>,
netdev@vger.kernel.org, davem@davemloft.net, Kernel-team@fb.com,
clm@fb.com, linux-mm@kvack.org, dbavatar@gmail.com,
Eric Dumazet <edumazet@google.com>
Subject: Re: [RFC V3] net: don't wait for order-3 page allocation
Date: Wed, 17 Jun 2015 16:02:59 -0700 (PDT) [thread overview]
Message-ID: <alpine.DEB.2.10.1506171602300.8203@chino.kir.corp.google.com> (raw)
In-Reply-To: <557AA834.8070503@suse.cz>
On Fri, 12 Jun 2015, Vlastimil Babka wrote:
> > diff --git a/net/core/skbuff.c b/net/core/skbuff.c
> > index 3cfff2a..41ec022 100644
> > --- a/net/core/skbuff.c
> > +++ b/net/core/skbuff.c
> > @@ -4398,7 +4398,7 @@ struct sk_buff *alloc_skb_with_frags(unsigned long
> > header_len,
> >
> > while (order) {
> > if (npages >= 1 << order) {
> > - page = alloc_pages(gfp_mask |
> > + page = alloc_pages((gfp_mask & ~__GFP_WAIT) |
> > __GFP_COMP |
> > __GFP_NOWARN |
> > __GFP_NORETRY,
>
> Note that __GFP_NORETRY is weaker than ~__GFP_WAIT and thus redundant. But it
> won't hurt anything leaving it there. And you might consider __GFP_NO_KSWAPD
> instead, as I said in the other thread.
>
Yeah, I agreed with __GFP_NO_KSWAPD to avoid utilizing memory reserves for
this.
> > diff --git a/net/core/sock.c b/net/core/sock.c
> > index 292f422..e9855a4 100644
> > --- a/net/core/sock.c
> > +++ b/net/core/sock.c
> > @@ -1883,7 +1883,7 @@ bool skb_page_frag_refill(unsigned int sz, struct
> > page_frag *pfrag, gfp_t gfp)
> >
> > pfrag->offset = 0;
> > if (SKB_FRAG_PAGE_ORDER) {
> > - pfrag->page = alloc_pages(gfp | __GFP_COMP |
> > + pfrag->page = alloc_pages((gfp & ~__GFP_WAIT) | __GFP_COMP |
> > __GFP_NOWARN | __GFP_NORETRY,
> > SKB_FRAG_PAGE_ORDER);
> > if (likely(pfrag->page)) {
> >
next prev parent reply other threads:[~2015-06-17 23:03 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-11 23:50 [RFC V3] net: don't wait for order-3 page allocation Shaohua Li
2015-06-11 23:50 ` Shaohua Li
2015-06-12 0:02 ` Eric Dumazet
2015-06-12 0:02 ` Eric Dumazet
2015-06-12 0:34 ` David Miller
2015-06-12 0:34 ` David Miller
2015-06-12 9:36 ` Vlastimil Babka
2015-06-12 9:36 ` Vlastimil Babka
2015-06-17 23:02 ` David Rientjes [this message]
2015-06-17 23:02 ` David Rientjes
2015-06-18 14:30 ` Michal Hocko
2015-06-18 14:30 ` Michal Hocko
2015-06-18 14:35 ` Eric Dumazet
2015-06-18 14:43 ` Michal Hocko
2015-06-18 14:43 ` Michal Hocko
2015-06-18 15:22 ` Vlastimil Babka
2015-06-18 15:47 ` Michal Hocko
2015-06-18 15:47 ` Michal Hocko
2015-06-30 23:49 ` David Rientjes
2015-06-30 23:49 ` David Rientjes
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