25 Jul, 2008
32 commits
-
free_area_init_node() gets passed in the node id as well as the node
descriptor. This is redundant as the function can trivially get the node
descriptor itself by means of NODE_DATA() and the node's id.I checked all the users and NODE_DATA() seems to be usable everywhere
from where this function is called.Signed-off-by: Johannes Weiner
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This is called on a per-page basis and in the vast majority of cases
`error' is zero.Cc: Guillaume Chazarain
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
SLOB reuses two page bits for internal purposes, it overlays PG_active and
PG_private. This is hidden away in slob.c. Document these overlays
explicitly in the main page-flags enum along with all the others.Signed-off-by: Andy Whitcroft
Cc: Pekka Enberg
Cc: Christoph Lameter
Cc: Matt Mackall
Cc: Nick Piggin
Reviewed-by: KOSAKI Motohiro
Cc: KOSAKI Motohiro
Cc: Rik van Riel
Cc: Jeremy Fitzhardinge
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
SLUB reuses two page bits for internal purposes, it overlays PG_active and
PG_error. This is hidden away in slub.c. Document these overlays
explicitly in the main page-flags enum along with all the others.Signed-off-by: Andy Whitcroft
Cc: Pekka Enberg
Cc: Christoph Lameter
Cc: Matt Mackall
Cc: Nick Piggin
Tested-by: KOSAKI Motohiro
Cc: KOSAKI Motohiro
Cc: Rik van Riel
Cc: Jeremy Fitzhardinge
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
With the recent page flag reorganisation we have a single enum which
defines the valid page flags and their values, nice and clear. However
there are a number of bits which are overloaded by different subsystems.
Firstly there is PG_owner_priv_1 which is used by filesystems and by XEN.
Secondly both SLOB and SLUB use a couple of extra page bits to manage
internal state for pages they own; both overlay other bits. All of these
"aliases" are scattered about the source making it very hard for a reader
to know if the bits are safe to rely on in all contexts; confusion here is
bad.As we now have a single place where the bits are clearly assigned it makes
sense to clarify the reuse of bits by making the aliases explicit and
visible with the original bit assignments. This patch creates explicit
aliases within the enum itself for the overloaded bits, creates standard
bit accessors PageFoo etc. and uses those throughout.This version pulls the bit manipulation out to standard named page bit
accessors as suggested by Christoph, it retains the explicit mapping to
the overlayed bits. A fusion of both ideas. This has been SLUB and SLOB
have been compile tested on x86_64 only, and SLUB boot tested. If people
feel this is worth doing then I can run a fuller set of testing.This patch:
Some page flags are used for more than one purpose, for example
PG_owner_priv_1. Currently there are individual accessors for each user,
each built using the common flag name far away from the bit definitions.
This makes it hard to see all possible uses of these bits.Now that we have a single enum to generate the bit orders it makes sense
to express overlays in the same place. So create per use aliases for this
bit in the main page-flags enum and use those in the accessors.[akpm@linux-foundation.org: fix xen]
Signed-off-by: Andy Whitcroft
Cc: Pekka Enberg
Cc: Christoph Lameter
Cc: Matt Mackall
Cc: Nick Piggin
Cc: KAMEZAWA Hiroyuki
Reviewed-by: KOSAKI Motohiro
Cc: Rik van Riel
Cc: Jeremy Fitzhardinge
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
[Summary]
Split LRU-list of unused dentries to one per superblock to avoid soft
lock up during NFS mounts and remounting of any filesystem.Previously I posted here:
http://lkml.org/lkml/2008/3/5/590[Descriptions]
- background
dentry_unused is a list of dentries which are not referenced.
dentry_unused grows up when references on directories or files are
released. This list can be very long if there is huge free memory.- the problem
When shrink_dcache_sb() is called, it scans all dentry_unused linearly
under spin_lock(), and if dentry->d_sb is differnt from given
superblock, scan next dentry. This scan costs very much if there are
many entries, and very ineffective if there are many superblocks.IOW, When we need to shrink unused dentries on one dentry, but scans
unused dentries on all superblocks in the system. For example, we scan
500 dentries to unmount a filesystem, but scans 1,000,000 or more unused
dentries on other superblocks.In our case , At mounting NFS*, shrink_dcache_sb() is called to shrink
unused dentries on NFS, but scans 100,000,000 unused dentries on
superblocks in the system such as local ext3 filesystems. I hear NFS
mounting took 1 min on some system in use.* : NFS uses virtual filesystem in rpc layer, so NFS is affected by
this problem.100,000,000 is possible number on large systems.
Per-superblock LRU of unused dentried can reduce the cost in
reasonable manner.- How to fix
I found this problem is solved by David Chinner's "Per-superblock
unused dentry LRU lists V3"(1), so I rebase it and add some fix to
reclaim with fairness, which is in Andrew Morton's comments(2).1) http://lkml.org/lkml/2006/5/25/318
2) http://lkml.org/lkml/2006/5/25/320Split LRU-list of unused dentries to each superblocks. Then, NFS
mounting will check dentries under a superblock instead of all. But
this spliting will break LRU of dentry-unused. So, I've attempted to
make reclaim unused dentrins with fairness by calculate number of
dentries to scan on this sb based on following waynumber of dentries to scan on this sb =
count * (number of dentries on this sb / number of dentries in the machine)- ToDo
- I have to measuring performance number and do stress tests.- When unmount occurs during prune_dcache(), scanning on same
superblock, It is unable to reach next superblock because it is gone
away. We restart scannig superblock from first one, it causes
unfairness of reclaim unused dentries on first superblock. But I think
this happens very rarely.- Test Results
Result on 6GB boxes with excessive unused dentries.
Without patch:
$ cat /proc/sys/fs/dentry-state
10181835 10180203 45 0 0 0
# mount -t nfs 10.124.60.70:/work/kernel-src nfs
real 0m1.830s
user 0m0.001s
sys 0m1.653sWith this patch:
$ cat /proc/sys/fs/dentry-state
10236610 10234751 45 0 0 0
# mount -t nfs 10.124.60.70:/work/kernel-src nfs
real 0m0.106s
user 0m0.002s
sys 0m0.032s[akpm@linux-foundation.org: fix comments]
Signed-off-by: Kentaro Makita
Cc: Neil Brown
Cc: Trond Myklebust
Cc: David Chinner
Cc: "J. Bruce Fields"
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
In __free_one_page(), the comment "Move the buddy up one level" appears
attached to the break and by implication when the break is taken we are
moving it up one level:if (!page_is_buddy(page, buddy, order))
break; /* Move the buddy up one level. */In reality the inverse is true, we break out when we can no longer merge
this page with its buddy. Looking back into pre-history (into the full
git history) it appears that these two lines accidentally got joined as
part of another change.Move the comment down where it belongs below the if and clarify its
language.Signed-off-by: Andy Whitcroft
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
The double indirection here is not needed anywhere and hence (at least)
confusing.Signed-off-by: Jan Beulich
Cc: Hugh Dickins
Cc: Nick Piggin
Cc: Christoph Lameter
Cc: Benjamin Herrenschmidt
Cc: Paul Mackerras
Cc: "Luck, Tony"
Cc: Paul Mundt
Cc: "David S. Miller"
Acked-by: Jeremy Fitzhardinge
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This uses the new vm_ops->access to allow gdb to access the SPU local
store. We currently prevent access to problem state registers, this can
be done later if really needed but it's safer not to.[akpm@linux-foundation.org: fix typo]
Signed-off-by: Benjamin Herrenschmidt
Signed-off-by: Rik van Riel
Cc: Dave Airlie
Cc: Hugh Dickins
Cc: Paul Mackerras
Cc: Arnd Bergmann
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This adds ioremap_prot and pte_pgprot() so that one can extract protection
bits from a PTE and use them to ioremap_prot() (in order to support ptrace
of VM_IO | VM_PFNMAP as per Rik's patch).This moves a couple of flag checks around in the ioremap implementations
of arch/powerpc. There's a side effect of allowing non-cacheable and
non-guarded mappings on ppc32 which before would always have _PAGE_GUARDED
set whenever _PAGE_NO_CACHE is.(standard ioremap will still set _PAGE_GUARDED, but ioremap_prot will be
capable of setting such a non guarded mapping).Signed-off-by: Benjamin Herrenschmidt
Signed-off-by: Rik van Riel
Cc: Dave Airlie
Cc: Hugh Dickins
Cc: Paul Mackerras
Cc: Arnd Bergmann
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Use generic_access_phys as the access_process_vm access function for
/dev/mem mappings. This makes it possible to debug the X server.[akpm@linux-foundation.org: repair all the architectures which broke]
Signed-off-by: Rik van Riel
Cc: Benjamin Herrensmidt
Cc: Dave Airlie
Cc: Hugh Dickins
Cc: Paul Mackerras
Cc: Arnd Bergmann
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
In order to be able to debug things like the X server and programs using
the PPC Cell SPUs, the debugger needs to be able to access device memory
through ptrace and /proc/pid/mem.This patch:
Add the generic_access_phys access function and put the hooks in place
to allow access_process_vm to access device or PPC Cell SPU memory.[riel@redhat.com: Add documentation for the vm_ops->access function]
Signed-off-by: Rik van Riel
Signed-off-by: Benjamin Herrensmidt
Cc: Dave Airlie
Cc: Hugh Dickins
Cc: Paul Mackerras
Cc: Arnd Bergmann
Acked-by: Peter Zijlstra
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
There are no users of nopfn in the tree. Remove it.
[hugh@veritas.com: fix build error]
Signed-off-by: Nick Piggin
Signed-off-by: Hugh Dickins
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
generic_file_direct_IO is a common helper around the invocation of
->direct_IO. But there's almost nothing shared between the read and write
side, so we're better off without this helper.[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Christoph Hellwig
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
It's confusing that set_max_huge_pages() contained two different
variables named "ret", and although the code works correctly this should
be fixed.The inner of the two variables can simply be removed.
Spotted by sparse.
Signed-off-by: Adrian Bunk
Cc: "KOSAKI Motohiro"
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This patch adds proper extern declarations for five variables in
include/linux/vmstat.hSigned-off-by: Adrian Bunk
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Every file should include the headers containing the externs for its
global functions (in this case for sys_move_pages()).Signed-off-by: Adrian Bunk
Acked-by: Christoph Lameter
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Two zonelist patch series rewrote __page_alloc() largely. Now, it is just
a wrapper function. Inlining them will save a function call.[akpm@linux-foundation.org: export __alloc_pages_internal]
Cc: Lee Schermerhorn
Cc: Mel Gorman
Signed-off-by: KOSAKI Motohiro
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
[akpm@linux-foundation.org: remove unused variable]
Signed-off-by: Nick Piggin
Acked-by: Jes Sorensen
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This function has no external callers, so unexport it. Also fix its naming
inconsistency.Signed-off-by: Johannes Weiner
Cc: Ingo Molnar
Cc: Yinghai Lu
Cc: Christoph Lameter
Cc: Mel Gorman
Cc: Andy Whitcroft
Cc: Mel Gorman
Cc: Andy Whitcroft
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
All _core functions only need the bootmem data, not the whole node descriptor.
Adjust the two functions that take the node descriptor unneededly.Signed-off-by: Johannes Weiner
Cc: Ingo Molnar
Cc: Yinghai Lu
Cc: Christoph Lameter
Cc: Mel Gorman
Cc: Andy Whitcroft
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
The check for node_boot_start is bogus because we start freeing at the
corresponding pfn. So check if the pfn is properly aligned instead in a more
readable way and adjust the documentation.Also remove an unneeded accounting variable.
Signed-off-by: Johannes Weiner
Cc: Ingo Molnar
Cc: Yinghai Lu
Cc: Christoph Lameter
Cc: Mel Gorman
Cc: Andy Whitcroft
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
There are a lot of places that define either a single bootmem descriptor or an
array of them. Use only one central array with MAX_NUMNODES items instead.Signed-off-by: Johannes Weiner
Acked-by: Ralf Baechle
Cc: Ingo Molnar
Cc: Richard Henderson
Cc: Russell King
Cc: Tony Luck
Cc: Hirokazu Takata
Cc: Geert Uytterhoeven
Cc: Kyle McMartin
Cc: Paul Mackerras
Cc: Paul Mundt
Cc: David S. Miller
Cc: Yinghai Lu
Cc: Christoph Lameter
Cc: Mel Gorman
Cc: Andy Whitcroft
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
lib/debugobjects.c has a function to test if an object is on the stack.
The block layer and ide needs it (they need to avoid DMA from/to stack
buffers). This patch moves the function to include/linux/sched.h so that
everyone can use it.lib/debugobjects.c uses current->stack but this patch uses a
task_stack_page() accessor, which is a preferable way to access the stack.Signed-off-by: FUJITA Tomonori
Cc: Christoph Lameter
Cc: Andy Whitcroft
Cc: Ingo Molnar
Cc: Thomas Gleixner
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This patch prints out the zonelists during boot for manual verification by the
user if the mminit_loglevel is MMINIT_VERIFY or higher.Signed-off-by: Mel Gorman
Cc: Christoph Lameter
Cc: Andy Whitcroft
Cc: Ingo Molnar
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
There are a number of different views to how much memory is currently active.
There is the arch-independent zone-sizing view, the bootmem allocator and
memory models view.Architectures register this information at different times and is not
necessarily in sync particularly with respect to some SPARSEMEM limitations.This patch introduces mminit_validate_memmodel_limits() which is able to
validate and correct PFN ranges with respect to the memory model. It is only
SPARSEMEM that currently validates itself.Signed-off-by: Mel Gorman
Cc: Christoph Lameter
Cc: Andy Whitcroft
Cc: Ingo Molnar
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Print out information on how the page flags are being used if mminit_loglevel
is MMINIT_VERIFY or higher and unconditionally performs sanity checks on the
flags regardless of loglevel.When the page flags are updated with section, node and zone information, a
check are made to ensure the values can be retrieved correctly. Finally we
confirm that pfn_to_page and page_to_pfn are the correct inverse functions.[akpm@linux-foundation.org: fix printk warnings]
Signed-off-by: Mel Gorman
Cc: Christoph Lameter
Cc: Andy Whitcroft
Cc: Ingo Molnar
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Boot initialisation is very complex, with significant numbers of
architecture-specific routines, hooks and code ordering. While significant
amounts of the initialisation is architecture-independent, it trusts the data
received from the architecture layer. This is a mistake, and has resulted in
a number of difficult-to-diagnose bugs.This patchset adds some validation and tracing to memory initialisation. It
also introduces a few basic defensive measures. The validation code can be
explicitly disabled for embedded systems.This patch:
Add additional debugging and verification code for memory initialisation.
Once enabled, the verification checks are always run and when required
additional debugging information may be outputted via a mminit_loglevel=
command-line parameter.The verification code is placed in a new file mm/mm_init.c. Ideally other mm
initialisation code will be moved here over time.Signed-off-by: Mel Gorman
Cc: Christoph Lameter
Cc: Andy Whitcroft
Cc: Ingo Molnar
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Flag platforms as HAVE_CLK (or not) in Kconfig, based on whether they
support calls, so that otherwise portable drivers which need
those calls can list that dependency.Something like this is a prerequisite for merging the musb_hdrc driver,
currently used on platforms including Davinci, OMAP2430, OMAP3xx ... and
the discrete TUSB6010 chip, which doesn't have a natural platform
dependency. (Used with OMAP 2420 in current Nokia N8x0 tablets.)Signed-off-by: David Brownell
Cc: Russell King
Acked-by: Haavard Skinnemoen
Cc: Benjamin Herrenschmidt
Cc: Paul Mackerras
Cc: Paul Mundt
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This patch removes the no longer used is_tty().
Signed-off-by: Adrian Bunk
Acked-by: Alan Cox
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
The existing HPET maintainer entries are somewhat unclear about which one
applies to what part of the kernel.Signed-off-by: Clemens Ladisch
Cc: Thomas Gleixner
Cc: Ingo Molnar
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
James Bottomley warns that inclusion of linux/fs.h in a low level
driver was always a danger signal. This patch moves
memory_read_from_buffer() from fs.h to string.h and fixes includes in
existing memory_read_from_buffer() users.Signed-off-by: Akinobu Mita
Cc: James Bottomley
Cc: Geert Uytterhoeven
Cc: Zhang Rui
Cc: Bob Moore
Cc: Thomas Renninger
Cc: Len Brown
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
24 Jul, 2008
8 commits
-
* 'x86/auditsc' of git://git.kernel.org/pub/scm/linux/kernel/git/frob/linux-2.6-roland:
i386 syscall audit fast-path
x86_64 ia32 syscall audit fast-path
x86_64 syscall audit fast-path
x86_64: remove bogus optimization in sysret_signal -
* 'sched/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
sched: hrtick_enabled() should use cpu_active()
sched, x86: clean up hrtick implementation
sched: fix build error, provide partition_sched_domains() unconditionally
sched: fix warning in inc_rt_tasks() to not declare variable 'rq' if it's not needed
cpu hotplug: Make cpu_active_map synchronization dependency clear
cpu hotplug, sched: Introduce cpu_active_map and redo sched domain managment (take 2)
sched: rework of "prioritize non-migratable tasks over migratable ones"
sched: reduce stack size in isolated_cpu_setup()
Revert parts of "ftrace: do not trace scheduler functions"Fixed up conflicts in include/asm-x86/thread_info.h (due to the
TIF_SINGLESTEP unification vs TIF_HRTICK_RESCHED removal) and
kernel/sched_fair.c (due to cpu_active_map vs for_each_cpu_mask_nr()
introduction). -
* 'cpus4096-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (31 commits)
NR_CPUS: Replace NR_CPUS in speedstep-centrino.c
cpumask: Provide a generic set of CPUMASK_ALLOC macros, FIXUP
NR_CPUS: Replace NR_CPUS in cpufreq userspace routines
NR_CPUS: Replace per_cpu(..., smp_processor_id()) with __get_cpu_var
NR_CPUS: Replace NR_CPUS in arch/x86/kernel/genapic_flat_64.c
NR_CPUS: Replace NR_CPUS in arch/x86/kernel/genx2apic_uv_x.c
NR_CPUS: Replace NR_CPUS in arch/x86/kernel/cpu/proc.c
NR_CPUS: Replace NR_CPUS in arch/x86/kernel/cpu/mcheck/mce_64.c
cpumask: Optimize cpumask_of_cpu in lib/smp_processor_id.c, fix
cpumask: Use optimized CPUMASK_ALLOC macros in the centrino_target
cpumask: Provide a generic set of CPUMASK_ALLOC macros
cpumask: Optimize cpumask_of_cpu in lib/smp_processor_id.c
cpumask: Optimize cpumask_of_cpu in kernel/time/tick-common.c
cpumask: Optimize cpumask_of_cpu in drivers/misc/sgi-xp/xpc_main.c
cpumask: Optimize cpumask_of_cpu in arch/x86/kernel/ldt.c
cpumask: Optimize cpumask_of_cpu in arch/x86/kernel/io_apic_64.c
cpumask: Replace cpumask_of_cpu with cpumask_of_cpu_ptr
Revert "cpumask: introduce new APIs"
cpumask: make for_each_cpu_mask a bit smaller
net: Pass reference to cpumask variable in net/sunrpc/svc.c
...Fix up trivial conflicts in drivers/cpufreq/cpufreq.c manually
-
…ernel/git/tip/linux-2.6-tip
* 'core/softlockup-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
softlockup: fix invalid proc_handler for softlockup_panic
softlockup: fix watchdog task wakeup frequency
softlockup: fix watchdog task wakeup frequency
softlockup: show irqtrace
softlockup: print a module list on being stuck
softlockup: fix NMI hangs due to lock race - 2.6.26-rc regression
softlockup: fix false positives on nohz if CPU is 100% idle for more than 60 seconds
softlockup: fix softlockup_thresh fix
softlockup: fix softlockup_thresh unaligned access and disable detection at runtime
softlockup: allow panic on lockup -
* 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm: (85 commits)
[ARM] pxa: add base support for PXA930 Handheld Platform (aka SAAR)
[ARM] pxa: add base support for PXA930 Evaluation Board (aka TavorEVB)
[ARM] pxa: add base support for PXA930 (aka Tavor-P)
[ARM] Update mach-types
[ARM] pxa: make littleton to use the new smc91x platform data
[ARM] pxa: make zylonite to use the new smc91x platform data
[ARM] pxa: make mainstone to use the new smc91x platform data
[ARM] pxa: make lubbock to use new smc91x platform data
[NET] smc91x: prepare SMC_USE_PXA_DMA to be specified in platform data
[NET] smc91x: prepare for SMC_IO_SHIFT to be a platform configurable variable
[NET] smc91x: add SMC91X_NOWAIT flag to platform data
[NET] smc91x: favor the use of SMC91X_USE_* instead of SMC_CAN_USE_*
[NET] smc91x: remove "irq_flags" from "struct smc91x_platdata"
[ARM] 5146/1: pxa2xx: convert all boards to call pxa2xx_transceiver_mode helper
Support for LCD on e740 e750 e400 and e800 e-series PDAs
E-series UDC support
PXA UDC - allow use of inverted GPIO for pullup
Add e350 support
Fix broken e-series build
E-series GPIO / IRQ definitions.
... -
This adds fast paths for 32-bit syscall entry and exit when
TIF_SYSCALL_AUDIT is set, but no other kind of syscall tracing.
These paths does not need to save and restore all registers as
the general case of tracing does. Avoiding the iret return path
when syscall audit is enabled helps performance a lot.Signed-off-by: Roland McGrath
-
This adds fast paths for 32-bit syscall entry and exit when
TIF_SYSCALL_AUDIT is set, but no other kind of syscall tracing.
These paths does not need to save and restore all registers as
the general case of tracing does. Avoiding the iret return path
when syscall audit is enabled helps performance a lot.Signed-off-by: Roland McGrath
-
This adds a fast path for 64-bit syscall entry and exit when
TIF_SYSCALL_AUDIT is set, but no other kind of syscall tracing.
This path does not need to save and restore all registers as
the general case of tracing does. Avoiding the iret return path
when syscall audit is enabled helps performance a lot.Signed-off-by: Roland McGrath
