/* * Copyright 2015, Michael Neuling, IBM Corp. * Licensed under GPLv2. * Original: Michael Neuling 19/7/2013 * Edited: Rashmica Gupta 01/12/2015 * * Do some transactions, see if the tar is corrupted. * If the transaction is aborted, the TAR should be rolled back to the * checkpointed value before the transaction began. The value written to * TAR in suspended mode should only remain in TAR if the transaction * completes. */ #include #include #include #include #include "tm.h" #include "utils.h" int num_loops = 10000; int test_tar(void) { int i; SKIP_IF(!have_htm()); for (i = 0; i < num_loops; i++) { uint64_t result = 0; asm __volatile__( "li 7, 1;" "mtspr %[tar], 7;" /* tar = 1 */ "tbegin.;" "beq 3f;" "li 4, 0x7000;" /* Loop lots, to use time */ "2:;" /* Start loop */ "li 7, 2;" "mtspr %[tar], 7;" /* tar = 2 */ "tsuspend.;" "li 7, 3;" "mtspr %[tar], 7;" /* tar = 3 */ "tresume.;" "subi 4, 4, 1;" "cmpdi 4, 0;" "bne 2b;" "tend.;" /* Transaction sucess! TAR should be 3 */ "mfspr 7, %[tar];" "ori %[res], 7, 4;" // res = 3|4 = 7 "b 4f;" /* Abort handler. TAR should be rolled back to 1 */ "3:;" "mfspr 7, %[tar];" "ori %[res], 7, 8;" // res = 1|8 = 9 "4:;" : [res]"=r"(result) : [tar]"i"(SPRN_TAR) : "memory", "r0", "r4", "r7"); /* If result is anything else other than 7 or 9, the tar * value must have been corrupted. */ if ((result != 7) && (result != 9)) return 1; } return 0; } int main(int argc, char *argv[]) { /* A low number of iterations (eg 100) can cause a false pass */ if (argc > 1) { if (strcmp(argv[1], "-h") == 0) { printf("Syntax:\n\t%s []\n", argv[0]); return 1; } else { num_loops = atoi(argv[1]); } } printf("Starting, %d loops\n", num_loops); return test_harness(test_tar, "tm_tar"); } f98194e4f6b6cae7'>commitdiff
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authorSteven Rostedt (VMware) <rostedt@goodmis.org>2017-01-30 19:27:10 -0500
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2017-01-31 09:13:49 -0500
commit79c6f448c8b79c321e4a1f31f98194e4f6b6cae7 (patch)
tree370efda701f03cccf21e02bb1fdd3b852547d75c /sound/usb/bcd2000
parent0c744ea4f77d72b3dcebb7a8f2684633ec79be88 (diff)
tracing: Fix hwlat kthread migration
The hwlat tracer creates a kernel thread at start of the tracer. It is pinned to a single CPU and will move to the next CPU after each period of running. If the user modifies the migration thread's affinity, it will not change after that happens. The original code created the thread at the first instance it was called, but later was changed to destroy the thread after the tracer was finished, and would not be created until the next instance of the tracer was established. The code that initialized the affinity was only called on the initial instantiation of the tracer. After that, it was not initialized, and the previous affinity did not match the current newly created one, making it appear that the user modified the thread's affinity when it did not, and the thread failed to migrate again. Cc: stable@vger.kernel.org Fixes: 0330f7aa8ee6 ("tracing: Have hwlat trace migrate across tracing_cpumask CPUs") Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'sound/usb/bcd2000')