1. 05 1月, 2018 12 次提交
  2. 23 12月, 2017 1 次提交
    • J
      blk-mq: improve heavily contended tag case · 4e5dff41
      Jens Axboe 提交于
      Even with a number of waitqueues, we can get into a situation where we
      are heavily contended on the waitqueue lock. I got a report on spc1
      where we're spending seconds doing this. Arguably the use case is nasty,
      I reproduce it with one device and 1000 threads banging on the device.
      But that doesn't mean we shouldn't be handling it better.
      
      What ends up happening is that a thread will fail to get a tag, add
      itself to the waitqueue, and subsequently get woken up when a tag is
      freed - only to find itself going back to sleep on the waitqueue.
      
      Instead of waking all threads, use an exclusive wait and wake up our
      sbitmap batch count instead. This seems to work well for me (massive
      improvement for this use case), and it survives basic testing. But I
      haven't fully verified it yet.
      
      An additional improvement is running the queue and checking for a new
      tag BEFORE needing to add ourselves to the waitqueue.
      Signed-off-by: NJens Axboe <axboe@kernel.dk>
      4e5dff41
  3. 18 12月, 2017 9 次提交
  4. 17 12月, 2017 15 次提交
  5. 16 12月, 2017 3 次提交
    • L
      Revert "mm: replace p??_write with pte_access_permitted in fault + gup paths" · f6f37321
      Linus Torvalds 提交于
      This reverts commits 5c9d2d5c, c7da82b8, and e7fe7b5c.
      
      We'll probably need to revisit this, but basically we should not
      complicate the get_user_pages_fast() case, and checking the actual page
      table protection key bits will require more care anyway, since the
      protection keys depend on the exact state of the VM in question.
      
      Particularly when doing a "remote" page lookup (ie in somebody elses VM,
      not your own), you need to be much more careful than this was.  Dave
      Hansen says:
      
       "So, the underlying bug here is that we now a get_user_pages_remote()
        and then go ahead and do the p*_access_permitted() checks against the
        current PKRU. This was introduced recently with the addition of the
        new p??_access_permitted() calls.
      
        We have checks in the VMA path for the "remote" gups and we avoid
        consulting PKRU for them. This got missed in the pkeys selftests
        because I did a ptrace read, but not a *write*. I also didn't
        explicitly test it against something where a COW needed to be done"
      
      It's also not entirely clear that it makes sense to check the protection
      key bits at this level at all.  But one possible eventual solution is to
      make the get_user_pages_fast() case just abort if it sees protection key
      bits set, which makes us fall back to the regular get_user_pages() case,
      which then has a vma and can do the check there if we want to.
      
      We'll see.
      
      Somewhat related to this all: what we _do_ want to do some day is to
      check the PAGE_USER bit - it should obviously always be set for user
      pages, but it would be a good check to have back.  Because we have no
      generic way to test for it, we lost it as part of moving over from the
      architecture-specific x86 GUP implementation to the generic one in
      commit e585513b ("x86/mm/gup: Switch GUP to the generic
      get_user_page_fast() implementation").
      
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Dan Williams <dan.j.williams@intel.com>
      Cc: Dave Hansen <dave.hansen@intel.com>
      Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
      Cc: "Jérôme Glisse" <jglisse@redhat.com>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Al Viro <viro@zeniv.linux.org.uk>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      f6f37321
    • L
      Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net · 7a3c296a
      Linus Torvalds 提交于
      Pull networking fixes from David Miller:
      
       1) Clamp timeouts to INT_MAX in conntrack, from Jay Elliot.
      
       2) Fix broken UAPI for BPF_PROG_TYPE_PERF_EVENT, from Hendrik
          Brueckner.
      
       3) Fix locking in ieee80211_sta_tear_down_BA_sessions, from Johannes
          Berg.
      
       4) Add missing barriers to ptr_ring, from Michael S. Tsirkin.
      
       5) Don't advertise gigabit in sh_eth when not available, from Thomas
          Petazzoni.
      
       6) Check network namespace when delivering to netlink taps, from Kevin
          Cernekee.
      
       7) Kill a race in raw_sendmsg(), from Mohamed Ghannam.
      
       8) Use correct address in TCP md5 lookups when replying to an incoming
          segment, from Christoph Paasch.
      
       9) Add schedule points to BPF map alloc/free, from Eric Dumazet.
      
      10) Don't allow silly mtu values to be used in ipv4/ipv6 multicast, also
          from Eric Dumazet.
      
      11) Fix SKB leak in tipc, from Jon Maloy.
      
      12) Disable MAC learning on OVS ports of mlxsw, from Yuval Mintz.
      
      13) SKB leak fix in skB_complete_tx_timestamp(), from Willem de Bruijn.
      
      14) Add some new qmi_wwan device IDs, from Daniele Palmas.
      
      15) Fix static key imbalance in ingress qdisc, from Jiri Pirko.
      
      * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (76 commits)
        net: qcom/emac: Reduce timeout for mdio read/write
        net: sched: fix static key imbalance in case of ingress/clsact_init error
        net: sched: fix clsact init error path
        ip_gre: fix wrong return value of erspan_rcv
        net: usb: qmi_wwan: add Telit ME910 PID 0x1101 support
        pkt_sched: Remove TC_RED_OFFLOADED from uapi
        net: sched: Move to new offload indication in RED
        net: sched: Add TCA_HW_OFFLOAD
        net: aquantia: Increment driver version
        net: aquantia: Fix typo in ethtool statistics names
        net: aquantia: Update hw counters on hw init
        net: aquantia: Improve link state and statistics check interval callback
        net: aquantia: Fill in multicast counter in ndev stats from hardware
        net: aquantia: Fill ndev stat couters from hardware
        net: aquantia: Extend stat counters to 64bit values
        net: aquantia: Fix hardware DMA stream overload on large MRRS
        net: aquantia: Fix actual speed capabilities reporting
        sock: free skb in skb_complete_tx_timestamp on error
        s390/qeth: update takeover IPs after configuration change
        s390/qeth: lock IP table while applying takeover changes
        ...
      7a3c296a
    • L
      Merge tag 'usb-4.15-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb · c36c7a7c
      Linus Torvalds 提交于
      Pull USB fixes from Greg KH:
       "Here are some USB fixes for 4.15-rc4.
      
        There is the usual handful gadget/dwc2/dwc3 fixes as always, for
        reported issues. But the most important things in here is the core fix
        from Alan Stern to resolve a nasty security bug (my first attempt is
        reverted, Alan's was much cleaner), as well as a number of usbip fixes
        from Shuah Khan to resolve those reported security issues.
      
        All of these have been in linux-next with no reported issues"
      
      * tag 'usb-4.15-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb:
        USB: core: prevent malicious bNumInterfaces overflow
        Revert "USB: core: only clean up what we allocated"
        USB: core: only clean up what we allocated
        Revert "usb: gadget: allow to enable legacy drivers without USB_ETH"
        usb: gadget: webcam: fix V4L2 Kconfig dependency
        usb: dwc2: Fix TxFIFOn sizes and total TxFIFO size issues
        usb: dwc3: gadget: Fix PCM1 for ISOC EP with ep->mult less than 3
        usb: dwc3: of-simple: set dev_pm_ops
        usb: dwc3: of-simple: fix missing clk_disable_unprepare
        usb: dwc3: gadget: Wait longer for controller to end command processing
        usb: xhci: fix TDS for MTK xHCI1.1
        xhci: Don't add a virt_dev to the devs array before it's fully allocated
        usbip: fix stub_send_ret_submit() vulnerability to null transfer_buffer
        usbip: prevent vhci_hcd driver from leaking a socket pointer address
        usbip: fix stub_rx: harden CMD_SUBMIT path to handle malicious input
        usbip: fix stub_rx: get_pipe() to validate endpoint number
        tools/usbip: fixes potential (minor) "buffer overflow" (detected on recent gcc with -Werror)
        USB: uas and storage: Add US_FL_BROKEN_FUA for another JMicron JMS567 ID
        usb: musb: da8xx: fix babble condition handling
      c36c7a7c