- 07 Dec, 2006 40 commits
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Eric Dumazet authored
Some dentries don't need to be globally visible in dentry hashtable. (pipes & sockets) Such dentries dont need to wait for a RCU grace period at delete time. Being able to free them permits a better CPU cache use (hot cache) This patch combined with (dont insert pipe dentries into dentry_hashtable) reduced time of { pipe(p); close(p[0]); close(p[1]);} on my UP machine (1.6 GHz Pentium-M) from 3.23 us to 2.86 us (But this patch does not depend on other patches, only bench results) Signed-off-by:Eric Dumazet <dada1@cosmosbay.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Maneesh Soni <maneesh@in.ibm.com> Cc: "Paul E. McKenney" <paulmck@us.ibm.com> Cc: Dipankar Sarma <dipankar@in.ibm.com> Acked-by:
David Miller <davem@davemloft.net> Signed-off-by:
Andrew Morton <akpm@osdl.org> Signed-off-by:
Linus Torvalds <torvalds@osdl.org>
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Eric Dumazet authored
We currently insert pipe dentries into the global dentry hashtable. This is suboptimal because there is currently no way these entries can be used for a lookup(). (/proc/xxx/fd/xxx uses a different mechanism). Inserting them in dentry hashtable slows dcache lookups. To let __dpath() still work correctly (ie not adding a " (deleted)") after dentry name, we do : - Right after d_alloc(), pretend they are hashed by clearing the DCACHE_UNHASHED bit. - Call d_instantiate() instead of d_add() : dentry is not inserted in hash table. __dpath() & friends work as intended during dentry lifetime. - At dismantle time, once dput() must clear the dentry, setting again DCACHE_UNHASHED bit inside the custom d_delete() function provided by pipe code, so that dput() can just kill_it. This patch, combined with (avoid RCU for never hashed dentries) reduced time of { pipe(p); close(p[0]); close(p[1]);} on my UP machine (1.6GHz Pentium-M) from 3.23 us to 2.86 us (But this patch does not depend on other patches, only bench results) Signed-off-by: -
Eric Dumazet authored
On some workloads, (for example when lot of close() syscalls are done), RCU qlen can be quite large, and RCU heads are no longer in cpu cache when rcu_do_batch() is called. This patch adds a prefetch() in rcu_do_batch() to give CPU a hint to bring back cache lines containing 'struct rcu_head's. Most list manipulations macros include prefetch(), but not open coded ones (at least with current C compilers :) ) I got a nice speedup on a trivial benchmark (3.48 us per iteration instead of 3.95 us on a 1.6 GHz Pentium-M) while (1) { pipe(p); close(fd[0]); close(fd[1]);} Signed-off-by: -
Randy Dunlap authored
Remove the videodev chapter from the kernel-api book. It's done much better in the videobook kernel-doc. Signed-off-by:
Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by:
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Randy Dunlap authored
Correct lots of typos, kernel-doc warnings, & kernel-doc usage in fusion and i2o drivers. Signed-off-by:
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Randy Dunlap authored
Add Fusion and I2O message-based device interfaces to kernel-api book. Signed-off-by:
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Randy Dunlap authored
When CONFIG_TOSHIBA=y and CONFIG_FB_NEOMAGIC=m, tosh_smm() needs to be exported for neofb to use it. WARNING: "tosh_smm" [drivers/video/neofb.ko] undefined! make[1]: *** [__modpost] Error 1 make: *** [modules] Error 2 Signed-off-by:
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Randy Dunlap authored
Building CCISS SCSI tape support in-kernel when SCSI=m causes build errors, so require SCSI support to be =y or same as CCISS SCSI tape support. drivers/built-in.o: In function `cciss_remove_one': cciss.c:(.text+0x79d4c): undefined reference to `scsi_remove_host' cciss.c:(.text+0x79d55): undefined reference to `scsi_host_put' drivers/built-in.o: In function `cciss_update_non_disk_devices': cciss.c:(.text+0x7bb54): undefined reference to `scsi_device_type' cciss.c:(.text+0x7bcc8): undefined reference to `scsi_device_type' cciss.c:(.text+0x7be81): undefined reference to `scsi_device_type' cciss.c:(.text+0x7bf81): undefined reference to `scsi_device_type' drivers/built-in.o: In function `cciss_proc_write': cciss.c:(.text+0x7c175): undefined reference to `scsi_host_alloc' cciss.c:(.text+0x7c1ed): undefined reference to `scsi_add_host' cciss.c:(.text+0x7c1f9): undefined reference to `scsi_scan_host' cciss.c:(.text+0x7c206): undefined reference to `scsi_host_put' make: *** [.tmp_vmlinux1] Error 1 Signed-off-by:
Mike Miller <mike.miller@hp.com> Signed-off-by:
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Yoichi Yuasa authored
[akpm@osdl.org: bugfix] Signed-off-by:
Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp> Cc: James Simmons <jsimmons@infradead.org> Cc: "Antonino A. Daplas" <adaplas@pol.net> Signed-off-by:
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David Brownell authored
This creates a new RTC-framework driver for the RTC/calendar module found in various OMAP1 chips. (OMAP2 and OMAP3 use external RTCs, like those in TI's multifunction PM companion chips.) It's been in the Linux-OMAP tree for several months now, and other trees before that, so it's quite stable. The most notable issue is that the OMAP IRQ code doesn't yet support the RTC IRQ as a wakeup event. Once that's fixed, a patch will be needed. Signed-off-by:
David Brownell <dbrownell@users.sourceforge.net> Acked-by:
Alessandro Zummo <a.zummo@towertech.it> Signed-off-by:
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Randy Dunlap authored
When CONFIG_HOTPLUG=n, agp_amd64_resume() calls nforce3_agp_init(), which is __devinit == __init, so has been discarded and is not usable for resume. WARNING: drivers/char/agp/amd64-agp.o - Section mismatch: reference to .init.text: from .text between 'agp_amd64_resume' (at offset 0x249) and 'amd64_tlbflush' Signed-off-by:
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Randy Dunlap authored
When CONFIG_HOTPLUG=n, parport_pc calls some __devinit == __init code that could be discarded. These calls are made from parport_irq_probe(), which is called from parport_pc_probe_port(), which is an exported symbol, so the calls could (possibly) happen after init time. WARNING: drivers/parport/parport_pc.o - Section mismatch: reference to .init.text: from .text between 'parport_irq_probe' (at offset 0x31d) and 'parport_pc_probe_port' WARNING: drivers/parport/parport_pc.o - Section mismatch: reference to .init.text: from .text between 'parport_irq_probe' (at offset 0x346) and 'parport_pc_probe_port' Signed-off-by:
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Adrian Bunk authored
Signed-off-by:
Adrian Bunk <bunk@stusta.de> Acked-by:
Eric W. Biederman <ebiederm@xmission.com> Signed-off-by:
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Adrian Bunk authored
Make the following needlessly global functions static: - nlm_lookup_host() - nsm_find() Signed-off-by:
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Adrian Bunk authored
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Adrian Bunk authored
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Adrian Bunk authored
Signed-off-by:
Michael Halcrow <mhalcrow@us.ibm.com> Signed-off-by:
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Randy Dunlap authored
With I2O_CONFIG=y and I2O_EXT_ADAPTEC=n, kernel build gets: drivers/message/i2o/i2o_config.c:1115: error: 'i2o_cfg_compat_ioctl' undeclared here (not in a function) Signed-off-by:
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Randy Dunlap authored
Handle __copy_from_user() return value. Noticed by inspection, not from build warning. Signed-off-by:
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Adrian Bunk authored
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Adrian Bunk authored
Remove the no longer used lockdep_internal(). Signed-off-by:
Ingo Molnar <mingo@elte.hu> Signed-off-by:
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Adrian Bunk authored
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Jan Beulich authored
Despite it being small, there should be the option of making it a module... Signed-off-by:
Jan Beulich <jbeulich@novell.com> Cc: Michael Buesch <mb@bu3sch.de> Signed-off-by:
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Mingming Cao authored
Hugh Dickins wrote: > Not found anything relevant, but I keep noticing these lines > in ext2_try_to_allocate_with_rsv(), ext3 and ext4 similar: > > } else if (grp_goal > 0 && > (my_rsv->rsv_end - grp_goal + 1) < *count) > try_to_extend_reservation(my_rsv, sb, > *count-my_rsv->rsv_end + grp_goal - 1); > > They're wrong, a no-op in most groups, aren't they? rsv_end is an > absolute block number, whereas grp_goal is group-relative, so the > calculation ought to bring in group_first_block? Or I'm confused. > Signed-off-by:
Mingming Cao <cmm@us.ibm.com> Cc: "linux-ext4@vger.kernel.org" <linux-ext4@vger.kernel.org> Cc: Hugh Dickins <hugh@veritas.com> Signed-off-by:
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Mingming Cao authored
Hugh Dickins wrote: > Not found anything relevant, but I keep noticing these lines > in ext2_try_to_allocate_with_rsv(), ext3 and ext4 similar: > > } else if (grp_goal > 0 && > (my_rsv->rsv_end - grp_goal + 1) < *count) > try_to_extend_reservation(my_rsv, sb, > *count-my_rsv->rsv_end + grp_goal - 1); > > They're wrong, a no-op in most groups, aren't they? rsv_end is an > absolute block number, whereas grp_goal is group-relative, so the > calculation ought to bring in group_first_block? Or I'm confused. > Signed-off-by:
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Ingo Molnar authored
There was lots of #ifdef noise in the kernel due to hotcpu_notifier(fn, prio) not correctly marking 'fn' as used in the !HOTPLUG_CPU case, and thus generating compiler warnings of unused symbols, hence forcing people to add #ifdefs. the compiler can skip truly unused functions just fine: text data bss dec hex filename 1624412 728710 3674856 6027978 5bfaca vmlinux.before 1624412 728710 3674856 6027978 5bfaca vmlinux.after [akpm@osdl.org: topology.c fix] Signed-off-by: -
Andrew Morton authored
smp_call_function_single() can deadlock if the caller disabled local interrupts (the target CPU could be spinning on call_lock). Check for that. Why on earth do these functions use spin_lock_bh()?? Cc: "Randy.Dunlap" <rdunlap@xenotime.net> Cc: Andi Kleen <ak@suse.de> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by:
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Randy Dunlap authored
smp_call_function_single() needs to be visible in non-SMP builds, to fix: arch/x86_64/kernel/vsyscall.c:283: warning: implicit declaration of function 'smp_call_function_single' Signed-off-by:
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Masami Hiramatsu authored
When we are unregistering a kprobe-booster, we can't release its instruction buffer immediately on the preemptive kernel, because some processes might be preempted on the buffer. The freeze_processes() and thaw_processes() functions can clean most of processes up from the buffer. There are still some non-frozen threads who have the PF_NOFREEZE flag. If those threads are sleeping (not preempted) at the known place outside the buffer, we can ensure safety of freeing. However, the processing of this check routine takes a long time. So, this patch introduces the garbage collection mechanism of insn_slot. It also introduces the "dirty" flag to free_insn_slot because of efficiency. The "clean" instruction slots (dirty flag is cleared) are released immediately. But the "dirty" slots which are used by boosted kprobes, are marked as garbages. collect_garbage_slots() will be invoked to release "dirty" slots if there are more than INSNS_PER_PAGE garbage slots or if there are no unused slots. Cc: "Keshavamurthy, Anil S" <anil.s.keshavamurthy@intel.com> Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: "bibo,mao" <bibo.mao@intel.com> Cc: Prasanna S Panchamukhi <prasanna@in.ibm.com> Cc: Yumiko Sugita <yumiko.sugita.yf@hitachi.com> Cc: Satoshi Oshima <soshima@redhat.com> Cc: Hideo Aoki <haoki@redhat.com> Signed-off-by:
Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Acked-by:
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Linas Vepstas authored
Move a block of code from the bottom of the file to the top, which is needed to enable the cleanup. Signed-off-by:
Linas Vepstas <linas@austin.ibm.com> Cc: Ryan S. Arnold <rsa@us.ibm.com> Cc: Michael Ellerman <michael@ellerman.id.au> Signed-off-by:
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Mariusz Kozlowski authored
Keeps sparse happy. Signed-of-by:
Mariusz Kozlowski <m.kozlowski@tuxland.pl> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Mauro Carvalho Chehab <mchehab@infradead.org> Acked-by:
Karsten Keil <kkeil@suse.de> Signed-off-by:
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Adrian Bunk authored
The scheduled removal of the OSS drivers depending on OSS_OBSOLETE_DRIVER. Signed-off-by:
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Alexey Dobriyan authored
Looks like, reiserfs_prepare_file_region_for_write() doesn't contain several flush_dcache_page() calls. Found with help from Dmitriy Monakhov <dmonakhov@openvz.org> [akpm@osdl.org: small speedup] Signed-off-by:
Alexey Dobriyan <adobriyan@openvz.org> Cc: Dmitriy Monakhov <dmonakhov@openvz.org> Signed-off-by:
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Magnus Damm authored
- Define "CORE" string as CORE_STR in single common place. - Include terminating zero in CORE_STR length calculation for elf_buflen. - Use roundup(,4) to include alignment in elf_buflen calculation. [akpm@osdl.org: simplification suggested by Roland] Signed-off-by:
Magnus Damm <magnus@valinux.co.jp> Cc: Daniel Jacobowitz <drow@false.org> Cc: Roland McGrath <roland@redhat.com> Cc: Jakub Jelinek <jakub@redhat.com> Signed-off-by:
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Magnus Damm authored
The ELF32 spec says we should plus we include the zero on other platforms. Signed-off-by:
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Magnus Damm authored
Define elf_addr_t in linux/elf.h. The size of the type is determined using ELF_CLASS. This allows us to remove the defines that today are spread all over .c and .h files. Signed-off-by:
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suzuki authored
Currently we allocate 64k space on the user stack and use it the msgbuf for sys_{msgrcv,msgsnd} for compat and the results are later copied in user [ by copy_in_user]. This patch introduces helper routines for sys_{msgrcv,msgsnd} as below: do_msgsnd() : Accepts the mtype and user space ptr to the buffer along with the msqid and msgflg. do_msgrcv() : Accepts a kernel space ptr to mtype and a userspace ptr to the buffer. The mtype has to be copied back the user space msgbuf by the caller. These changes avoid the need to allocate the msgsize on the userspace ( thus removing the size limt ) and the overhead of an extra copy_in_user(). Signed-off-by:Suzuki K P <suzuki@in.ibm.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: "David S. Miller" <davem@davemloft.net> Signed-off-by:
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Henry Nestler authored
After LOADER_TYPE && INITRD_START are true, the short if-condition for INITRD_START can never be false. Remove unused code from the else condition. Signed-off-by:
Henry Nestler <henry.ne@arcor.de> Signed-off-by:
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Valdis Kletnieks authored
scripts/ver_linux needed some minor clean-ups, as follows: 1) Add reporting of actual oprofile release 2) Add reporting of actual wireless-tools release 3) Add reporting of actual pcmciautils release Signed-off-by:
Valdis Kletnieks <valdis.kletnieks@vt.edu> Signed-off-by:
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Mike Galbraith authored
Attempts to read() from the non-existent dmesg buffer will return zero and userspace tends to get stuck in a busyloop. So just remove /dev/kmsg altogether if CONFIG_PRINTK=n. Signed-off-by:
Mike Galbraith <efault@gmx.de> Signed-off-by:
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