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| author | Jan Glauber <jang@linux.vnet.ibm.com> | 2012-07-31 12:52:05 +0400 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2012-09-26 17:45:02 +0400 |
| commit | e4b8b3f33fcaa0ed6e6b5482a606091d8cd20beb (patch) | |
| tree | 7f1e47eafd75cb11bed5b91c2c13813eb6204fc8 /arch/s390/include/asm/cpu_mf.h | |
| parent | 0d804b20735d974534abb422f723d404b779433a (diff) | |
| download | linux-e4b8b3f33fcaa0ed6e6b5482a606091d8cd20beb.tar.xz | |
s390: add support for runtime instrumentation
Allow user-space threads to use runtime instrumentation (RI). To enable RI
for a thread there is a new s390 specific system call, sys_s390_runtime_instr,
that takes as parameter a realtime signal number. If the RI facility is
available the system call sets up a control block for the calling thread with
the appropriate permissions for the thread to modify the control block.
The user-space thread can then use the store and modify RI instructions to
alter the control block and start/stop the instrumentation via RION/RIOFF.
If the user specified program buffer runs full RI triggers an external
interrupt. The external interrupt is translated to a real-time signal that
is delivered to the thread that enabled RI on that CPU. The number of
the real-time signal is the number specified in the RI system call. So,
user-space can select any available real-time signal number in case the
application itself uses real-time signals for other purposes.
The kernel saves the RI control blocks on task switch only if the running
thread was enabled for RI. Therefore, the performance impact on task switch
should be negligible if RI is not used.
RI is only enabled for user-space mode and is disabled for the supervisor
state.
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/include/asm/cpu_mf.h')
| -rw-r--r-- | arch/s390/include/asm/cpu_mf.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/s390/include/asm/cpu_mf.h b/arch/s390/include/asm/cpu_mf.h index a3afecdae145..35f0020b7ba7 100644 --- a/arch/s390/include/asm/cpu_mf.h +++ b/arch/s390/include/asm/cpu_mf.h @@ -21,11 +21,15 @@ #define CPU_MF_INT_SF_LSDA (1 << 22) /* loss of sample data alert */ #define CPU_MF_INT_CF_CACA (1 << 7) /* counter auth. change alert */ #define CPU_MF_INT_CF_LCDA (1 << 6) /* loss of counter data alert */ +#define CPU_MF_INT_RI_HALTED (1 << 5) /* run-time instr. halted */ +#define CPU_MF_INT_RI_BUF_FULL (1 << 4) /* run-time instr. program + buffer full */ #define CPU_MF_INT_CF_MASK (CPU_MF_INT_CF_CACA|CPU_MF_INT_CF_LCDA) #define CPU_MF_INT_SF_MASK (CPU_MF_INT_SF_IAE|CPU_MF_INT_SF_ISE| \ CPU_MF_INT_SF_PRA|CPU_MF_INT_SF_SACA| \ CPU_MF_INT_SF_LSDA) +#define CPU_MF_INT_RI_MASK (CPU_MF_INT_RI_HALTED|CPU_MF_INT_RI_BUF_FULL) /* CPU measurement facility support */ static inline int cpum_cf_avail(void) |