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authorLinus Torvalds <torvalds@linux-foundation.org>2014-08-14 10:14:07 -0600
committerLinus Torvalds <torvalds@linux-foundation.org>2014-08-14 10:14:07 -0600
commit1d508f8ace3e78e96da70f1cf4e36b80f22b5fa9 (patch)
tree1374288c038234bff0bde464be72f0645ed44f33 /include
parent2d0c05e1c5a6587a13c910845229ec5cdcd387f9 (diff)
parent9e813308a5c18c58f9ccae1ec72ed4e14eaf9025 (diff)
Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc
Pull more powerpc updates from Ben Herrenschmidt: "Here are some more powerpc bits for 3.17, essentially fixes. The biggest series, also aimed at -stable, is from Aneesh and is the result of weeks and weeks of debugging to find out why the heck or THP implementation was occasionally triggering multi-hit errors in our level 1 TLB. It ended up being a combination of issues including subtleties as to how we should invalidate those special 'MPSS' pages we use to allow the use of 16M pages inside 4K/64K "base page size" segments (you really have to love our MMU !) Another interesting one in the "OMG" category is the series from Michael adding memory barriers to spin_is_locked(). That's also the result of many days of debugging to figure out why the semaphore code would occasionally crash in ways that made no sense. It ended up being some creative lock stacking that was defeated by the fact that our locks allow a load inside the locked section to be re-ordered with the load of the lock value itself (I'm still of two mind about whether to kill that once and for all by putting a heavier barrier back into our lock implementation...). The fixes come with a long explanation in the cset comments, feel free to read it if you feel like having a headache today" * 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc: (25 commits) powerpc/thp: Add tracepoints to track hugepage invalidate powerpc/mm: Use read barrier when creating real_pte powerpc/thp: Use ACCESS_ONCE when loading pmdp powerpc/thp: Invalidate with vpn in loop powerpc/thp: Handle combo pages in invalidate powerpc/thp: Invalidate old 64K based hash page mapping before insert of 4k pte powerpc/thp: Don't recompute vsid and ssize in loop on invalidate powerpc/thp: Add write barrier after updating the valid bit powerpc: reorder per-cpu NUMA information's initialization powerpc/perf/hv-24x7: Use kmem_cache_free powerpc/pseries/hvcserver: Fix endian issue in hvcs_get_partner_info powerpc: Hard disable interrupts in xmon powerpc: remove duplicate definition of TEXASR_FS powerpc/pseries: Avoid deadlock on removing ddw powerpc/pseries: Failure on removing device node powerpc/boot: Use correct zlib types for comparison powerpc/powernv: Interface to register/unregister opal dump region printk: Add function to return log buffer address and size powerpc: Add POWER8 features to CPU_FTRS_POSSIBLE/ALWAYS powerpc/ppc476: Disable BTAC ...
Diffstat (limited to 'include')
-rw-r--r--include/linux/printk.h3
-rw-r--r--include/trace/events/thp.h88
2 files changed, 91 insertions, 0 deletions
diff --git a/include/linux/printk.h b/include/linux/printk.h
index 0990997a5304..d78125f73ac4 100644
--- a/include/linux/printk.h
+++ b/include/linux/printk.h
@@ -10,6 +10,9 @@
extern const char linux_banner[];
extern const char linux_proc_banner[];
+extern char *log_buf_addr_get(void);
+extern u32 log_buf_len_get(void);
+
static inline int printk_get_level(const char *buffer)
{
if (buffer[0] == KERN_SOH_ASCII && buffer[1]) {
diff --git a/include/trace/events/thp.h b/include/trace/events/thp.h
new file mode 100644
index 000000000000..b59b065e9e5d
--- /dev/null
+++ b/include/trace/events/thp.h
@@ -0,0 +1,88 @@
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM thp
+
+#if !defined(_TRACE_THP_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_THP_H
+
+#include <linux/types.h>
+#include <linux/tracepoint.h>
+
+TRACE_EVENT(hugepage_invalidate,
+
+ TP_PROTO(unsigned long addr, unsigned long pte),
+ TP_ARGS(addr, pte),
+ TP_STRUCT__entry(
+ __field(unsigned long, addr)
+ __field(unsigned long, pte)
+ ),
+
+ TP_fast_assign(
+ __entry->addr = addr;
+ __entry->pte = pte;
+ ),
+
+ TP_printk("hugepage invalidate at addr 0x%lx and pte = 0x%lx",
+ __entry->addr, __entry->pte)
+);
+
+TRACE_EVENT(hugepage_set_pmd,
+
+ TP_PROTO(unsigned long addr, unsigned long pmd),
+ TP_ARGS(addr, pmd),
+ TP_STRUCT__entry(
+ __field(unsigned long, addr)
+ __field(unsigned long, pmd)
+ ),
+
+ TP_fast_assign(
+ __entry->addr = addr;
+ __entry->pmd = pmd;
+ ),
+
+ TP_printk("Set pmd with 0x%lx with 0x%lx", __entry->addr, __entry->pmd)
+);
+
+
+TRACE_EVENT(hugepage_update,
+
+ TP_PROTO(unsigned long addr, unsigned long pte, unsigned long clr, unsigned long set),
+ TP_ARGS(addr, pte, clr, set),
+ TP_STRUCT__entry(
+ __field(unsigned long, addr)
+ __field(unsigned long, pte)
+ __field(unsigned long, clr)
+ __field(unsigned long, set)
+ ),
+
+ TP_fast_assign(
+ __entry->addr = addr;
+ __entry->pte = pte;
+ __entry->clr = clr;
+ __entry->set = set;
+
+ ),
+
+ TP_printk("hugepage update at addr 0x%lx and pte = 0x%lx clr = 0x%lx, set = 0x%lx", __entry->addr, __entry->pte, __entry->clr, __entry->set)
+);
+TRACE_EVENT(hugepage_splitting,
+
+ TP_PROTO(unsigned long addr, unsigned long pte),
+ TP_ARGS(addr, pte),
+ TP_STRUCT__entry(
+ __field(unsigned long, addr)
+ __field(unsigned long, pte)
+ ),
+
+ TP_fast_assign(
+ __entry->addr = addr;
+ __entry->pte = pte;
+ ),
+
+ TP_printk("hugepage splitting at addr 0x%lx and pte = 0x%lx",
+ __entry->addr, __entry->pte)
+);
+
+#endif /* _TRACE_THP_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>