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[IA64] another perfmon fix (take2)

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- pfm_context_load(): change return value from EINVAL to EBUSY
  when context is already loaded.

- pfm_check_task_state(): pass test if context state is MASKED.
  It is safe to give access on PFM_CTX_MASKED because the PMU
  state (PMD) is stable and saved in software state.
  This helps multiplexing programs such as the example given
  in libpfm-3.1.

Signed-off-by: stephane eranian <eranian@hpl.hp.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
stephane eranian 2005-04-18 11:42:00 -07:00 committed by Tony Luck
parent 8df5a500a3
commit a5a70b75d9
1 changed files with 20 additions and 10 deletions
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18
arch/ia64/kernel/perfmon.c
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@ -4215,7 +4215,7 @@ pfm_context_load(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
DPRINT(("cannot load to [%d], invalid ctx_state=%d\n",
req->load_pid,
ctx->ctx_state));
return -EINVAL;
return -EBUSY;
}
DPRINT(("load_pid [%d] using_dbreg=%d\n", req->load_pid, ctx->ctx_fl_using_dbreg));
@ -4716,17 +4716,27 @@ recheck:
*/
if (task == current || ctx->ctx_fl_system) return 0;
/*
* we are monitoring another thread
*/
switch(state) {
case PFM_CTX_UNLOADED:
/*
* if context is UNLOADED we are safe to go
*/
if (state == PFM_CTX_UNLOADED) return 0;
return 0;
case PFM_CTX_ZOMBIE:
/*
* no command can operate on a zombie context
*/
if (state == PFM_CTX_ZOMBIE) {
DPRINT(("cmd %d state zombie cannot operate on context\n", cmd));
return -EINVAL;
case PFM_CTX_MASKED:
/*
* PMU state has been saved to software even though
* the thread may still be running.
*/
if (cmd != PFM_UNLOAD_CONTEXT) return 0;
}
/*