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SubjectRe: [GIT pull] x86/pti: The real thing
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On Fri, 2017-12-29 at 17:42 -0800, Linus Torvalds wrote:
> On Thu, Dec 28, 2017 at 12:34 PM, Thomas Gleixner <tglx@linutronix.de> wrote:
> >
> > please pull the latest x86-pti-for-linus git tree from:
> >
> > git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86-pti-for-linus
> >
> > This is the final set of enabling page table isolation on x86:
>
> Ok, after that late MCORE2 scare that held things up, this is now
> merged in my tree and pushed out. "WorksForMe(tm)".

But it definitely ain't free.  NFS hanging out in the kernel for 82ms
at a whack may not be such a bad idea after all ;-)

i4790+tbench

CONFIG_PAGE_TABLE_ISOLATION=y
Throughput 3467.72 MB/sec 8 clients 8 procs max_latency=3.499 ms

CONFIG_PAGE_TABLE_ISOLATION=n
Throughput 3700.81 MB/sec 8 clients 8 procs max_latency=4.893 ms

CONFIG_PAGE_TABLE_ISOLATION=y CONFIG_PAGE_TABLE_ISOLATION=n
4.48% [k] syscall_return_via_sysret 3.56% [k] copy_user_enhanced_fast_string
3.41% [k] copy_user_enhanced_fast_string 2.54% [.] child_run
2.48% [.] child_run 1.76% [k] tcp_transmit_skb
1.64% [.] __strchr_sse2 1.74% [k] tcp_recvmsg
1.60% [k] tcp_transmit_skb 1.69% [.] __strchr_sse2
1.55% [k] tcp_recvmsg 1.56% [.] __GI_____strtoll_l_internal
1.46% [k] ipt_do_table 1.44% [k] ipt_do_table
1.45% [.] __GI_____strtoll_l_internal 1.42% [k] tcp_sendmsg_locked
1.25% [k] tcp_in_window 1.34% [k] tcp_write_xmit
1.21% [.] next_token 1.34% [k] tcp_clean_rtx_queue
1.17% [k] tcp_clean_rtx_queue 1.26% [.] next_token
1.16% [k] tcp_sendmsg_locked 1.24% [k] tcp_in_window
1.15% [k] __switch_to 1.19% [k] nf_conntrack_in
1.10% [k] switch_mm_irqs_off 1.17% [k] __switch_to
1.09% [k] tcp_write_xmit 1.13% [.] __strcasecmp_l_avx
1.09% [k] tcp_ack 1.10% [k] switch_mm_irqs_off
1.08% [k] nf_hook_slow 1.08% [k] tcp_v4_rcv
1.04% [k] __sched_text_start 1.06% [k] nf_hook_slow
0.99% [.] __strcasecmp_l_avx 1.05% [k] tcp_ack

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