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924d21d904
On VM-based builders, the nvmem unittest was sometimes missing the 10-second deadline, likely being stuck in slow I/Os. Try to move the persistent storage files used for flash 'emulation' on host from the build directory to a RAM-backed filesystem in /dev/shm in order to mitigate this bottleneck. Store the new backing files in a path like: /dev/shm/EC_persist__mnt_host_source_src_platform_ec_build_host_nvmem_nvmem.exe_flash in order to keep the properties of the old system: subsequent runs of the same build will use the same persistent storage but 2 different trees won't mix up. Signed-off-by: Vincent Palatin <vpalatin@chromium.org> BRANCH=none BUG=chromium:715011 TEST=make runtests TEST=run the following command with and without this change: 'for i in 0 1 2 3 4 5 6 7 8 9 ; do time make run-nvmem ; done' and see the average test time around 500 ms without the change and around 320 ms with it on an idle and beefy workstation. Change-Id: Ic2ff6511b81869171efc484ca805f8c0d6008595 Reviewed-on: https://chromium-review.googlesource.com/893380 Commit-Ready: Vincent Palatin <vpalatin@chromium.org> Tested-by: Vincent Palatin <vpalatin@chromium.org> Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
65 lines
1.3 KiB
C
65 lines
1.3 KiB
C
/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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/* Persistence module for emulator */
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#include <linux/limits.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <string.h>
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static void get_storage_path(char *out)
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{
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char buf[PATH_MAX];
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int sz;
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char *current;
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sz = readlink("/proc/self/exe", buf, PATH_MAX - 1);
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buf[sz] = '\0';
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/* replace / by underscores in the path to get the shared memory name */
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current = strchr(buf, '/');
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while (current) {
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*current = '_';
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current = strchr(current, '/');
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}
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snprintf(out, PATH_MAX - 1, "/dev/shm/EC_persist_%s", buf);
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out[PATH_MAX - 1] = '\0';
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}
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FILE *get_persistent_storage(const char *tag, const char *mode)
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{
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char buf[PATH_MAX];
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char path[PATH_MAX];
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/*
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* The persistent storage with tag 'foo' for test 'bar' would
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* be named 'bar_persist_foo'
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*/
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get_storage_path(buf);
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snprintf(path, PATH_MAX - 1, "%s_%s", buf, tag);
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path[PATH_MAX - 1] = '\0';
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return fopen(path, mode);
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}
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void release_persistent_storage(FILE *ps)
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{
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fclose(ps);
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}
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void remove_persistent_storage(const char *tag)
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{
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char buf[PATH_MAX];
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char path[PATH_MAX];
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get_storage_path(buf);
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snprintf(path, PATH_MAX - 1, "%s_%s", buf, tag);
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path[PATH_MAX - 1] = '\0';
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unlink(path);
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}
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