diff options
Diffstat (limited to 'libpagemap')
| -rw-r--r-- | libpagemap/Android.mk | 30 | ||||
| -rw-r--r-- | libpagemap/MODULE_LICENSE_APACHE2 | 0 | ||||
| -rw-r--r-- | libpagemap/NOTICE | 190 | ||||
| -rw-r--r-- | libpagemap/include/pagemap/pagemap.h | 171 | ||||
| -rw-r--r-- | libpagemap/pm_kernel.c | 158 | ||||
| -rw-r--r-- | libpagemap/pm_map.c | 125 | ||||
| -rw-r--r-- | libpagemap/pm_map.h | 24 | ||||
| -rw-r--r-- | libpagemap/pm_memusage.c | 28 | ||||
| -rw-r--r-- | libpagemap/pm_process.c | 290 |
9 files changed, 1016 insertions, 0 deletions
diff --git a/libpagemap/Android.mk b/libpagemap/Android.mk new file mode 100644 index 00000000..b38363c8 --- /dev/null +++ b/libpagemap/Android.mk @@ -0,0 +1,30 @@ +# Copyright (C) 2008 The Android Open Source Project +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. + +LOCAL_PATH := $(call my-dir) +include $(CLEAR_VARS) + +LOCAL_MODULE := libpagemap +LOCAL_MODULE_TAGS := debug +LOCAL_PRELINK_MODULE := false + +LOCAL_SRC_FILES := \ + pm_kernel.c \ + pm_process.c \ + pm_map.c \ + pm_memusage.c + +LOCAL_C_INCLUDES := $(LOCAL_PATH)/include + +include $(BUILD_SHARED_LIBRARY) diff --git a/libpagemap/MODULE_LICENSE_APACHE2 b/libpagemap/MODULE_LICENSE_APACHE2 new file mode 100644 index 00000000..e69de29b --- /dev/null +++ b/libpagemap/MODULE_LICENSE_APACHE2 diff --git a/libpagemap/NOTICE b/libpagemap/NOTICE new file mode 100644 index 00000000..c5b1efa7 --- /dev/null +++ b/libpagemap/NOTICE @@ -0,0 +1,190 @@ + + Copyright (c) 2005-2008, The Android Open Source Project + + Licensed under the Apache License, Version 2.0 (the "License"); + you may not use this file except in compliance with the License. + + Unless required by applicable law or agreed to in writing, software + distributed under the License is distributed on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + See the License for the specific language governing permissions and + limitations under the License. + + + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + + TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + + 1. Definitions. + + "License" shall mean the terms and conditions for use, reproduction, + and distribution as defined by Sections 1 through 9 of this document. + + "Licensor" shall mean the copyright owner or entity authorized by + the copyright owner that is granting the License. + + "Legal Entity" shall mean the union of the acting entity and all + other entities that control, are controlled by, or are under common + control with that entity. For the purposes of this definition, + "control" means (i) the power, direct or indirect, to cause the + direction or management of such entity, whether by contract or + otherwise, or (ii) ownership of fifty percent (50%) or more of the + outstanding shares, or (iii) beneficial ownership of such entity. + + "You" (or "Your") shall mean an individual or Legal Entity + exercising permissions granted by this License. + + "Source" form shall mean the preferred form for making modifications, + including but not limited to software source code, documentation + source, and configuration files. + + "Object" form shall mean any form resulting from mechanical + transformation or translation of a Source form, including but + not limited to compiled object code, generated documentation, + and conversions to other media types. + + "Work" shall mean the work of authorship, whether in Source or + Object form, made available under the License, as indicated by a + copyright notice that is included in or attached to the work + (an example is provided in the Appendix below). + + "Derivative Works" shall mean any work, whether in Source or Object + form, that is based on (or derived from) the Work and for which the + editorial revisions, annotations, elaborations, or other modifications + represent, as a whole, an original work of authorship. For the purposes + of this License, Derivative Works shall not include works that remain + separable from, or merely link (or bind by name) to the interfaces of, + the Work and Derivative Works thereof. + + "Contribution" shall mean any work of authorship, including + the original version of the Work and any modifications or additions + to that Work or Derivative Works thereof, that is intentionally + submitted to Licensor for inclusion in the Work by the copyright owner + or by an individual or Legal Entity authorized to submit on behalf of + the copyright owner. For the purposes of this definition, "submitted" + means any form of electronic, verbal, or written communication sent + to the Licensor or its representatives, including but not limited to + communication on electronic mailing lists, source code control systems, + and issue tracking systems that are managed by, or on behalf of, the + Licensor for the purpose of discussing and improving the Work, but + excluding communication that is conspicuously marked or otherwise + designated in writing by the copyright owner as "Not a Contribution." + + "Contributor" shall mean Licensor and any individual or Legal Entity + on behalf of whom a Contribution has been received by Licensor and + subsequently incorporated within the Work. + + 2. Grant of Copyright License. Subject to the terms and conditions of + this License, each Contributor hereby grants to You a perpetual, + worldwide, non-exclusive, no-charge, royalty-free, irrevocable + copyright license to reproduce, prepare Derivative Works of, + publicly display, publicly perform, sublicense, and distribute the + Work and such Derivative Works in Source or Object form. + + 3. Grant of Patent License. Subject to the terms and conditions of + this License, each Contributor hereby grants to You a perpetual, + worldwide, non-exclusive, no-charge, royalty-free, irrevocable + (except as stated in this section) patent license to make, have made, + use, offer to sell, sell, import, and otherwise transfer the Work, + where such license applies only to those patent claims licensable + by such Contributor that are necessarily infringed by their + Contribution(s) alone or by combination of their Contribution(s) + with the Work to which such Contribution(s) was submitted. If You + institute patent litigation against any entity (including a + cross-claim or counterclaim in a lawsuit) alleging that the Work + or a Contribution incorporated within the Work constitutes direct + or contributory patent infringement, then any patent licenses + granted to You under this License for that Work shall terminate + as of the date such litigation is filed. + + 4. Redistribution. You may reproduce and distribute copies of the + Work or Derivative Works thereof in any medium, with or without + modifications, and in Source or Object form, provided that You + meet the following conditions: + + (a) You must give any other recipients of the Work or + Derivative Works a copy of this License; and + + (b) You must cause any modified files to carry prominent notices + stating that You changed the files; and + + (c) You must retain, in the Source form of any Derivative Works + that You distribute, all copyright, patent, trademark, and + attribution notices from the Source form of the Work, + excluding those notices that do not pertain to any part of + the Derivative Works; and + + (d) If the Work includes a "NOTICE" text file as part of its + distribution, then any Derivative Works that You distribute must + include a readable copy of the attribution notices contained + within such NOTICE file, excluding those notices that do not + pertain to any part of the Derivative Works, in at least one + of the following places: within a NOTICE text file distributed + as part of the Derivative Works; within the Source form or + documentation, if provided along with the Derivative Works; or, + within a display generated by the Derivative Works, if and + wherever such third-party notices normally appear. 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In no event and under no legal theory, + whether in tort (including negligence), contract, or otherwise, + unless required by applicable law (such as deliberate and grossly + negligent acts) or agreed to in writing, shall any Contributor be + liable to You for damages, including any direct, indirect, special, + incidental, or consequential damages of any character arising as a + result of this License or out of the use or inability to use the + Work (including but not limited to damages for loss of goodwill, + work stoppage, computer failure or malfunction, or any and all + other commercial damages or losses), even if such Contributor + has been advised of the possibility of such damages. + + 9. Accepting Warranty or Additional Liability. While redistributing + the Work or Derivative Works thereof, You may choose to offer, + and charge a fee for, acceptance of support, warranty, indemnity, + or other liability obligations and/or rights consistent with this + License. However, in accepting such obligations, You may act only + on Your own behalf and on Your sole responsibility, not on behalf + of any other Contributor, and only if You agree to indemnify, + defend, and hold each Contributor harmless for any liability + incurred by, or claims asserted against, such Contributor by reason + of your accepting any such warranty or additional liability. + + END OF TERMS AND CONDITIONS + diff --git a/libpagemap/include/pagemap/pagemap.h b/libpagemap/include/pagemap/pagemap.h new file mode 100644 index 00000000..09ff29d8 --- /dev/null +++ b/libpagemap/include/pagemap/pagemap.h @@ -0,0 +1,171 @@ +/* + * Copyright (C) 2008 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#ifndef _PAGEMAP_PAGEMAP_H +#define _PAGEMAP_PAGEMAP_H + +#include <stdint.h> +#include <stdio.h> +#include <sys/types.h> + +typedef struct pm_memusage pm_memusage_t; + +/* Holds the various metrics for memory usage of a process or a mapping. */ +struct pm_memusage { + size_t vss; + size_t rss; + size_t pss; + size_t uss; +}; + +/* Clears a memusage. */ +void pm_memusage_zero(pm_memusage_t *mu); +/* Adds one memusage (a) to another (b). */ +void pm_memusage_add(pm_memusage_t *a, pm_memusage_t *b); + +typedef struct pm_kernel pm_kernel_t; +typedef struct pm_process pm_process_t; +typedef struct pm_map pm_map_t; + +/* pm_kernel_t holds the state necessary to interface to the kernel's pagemap + * system on a global level. */ +struct pm_kernel { + int kpagecount_fd; + int kpageflags_fd; + + int pagesize; +}; + +/* pm_process_t holds the state necessary to interface to a particular process' + * pagemap. */ +struct pm_process { + pm_kernel_t *ker; + + pid_t pid; + + pm_map_t **maps; + int num_maps; + + int pagemap_fd; +}; + +/* pm_map_t holds the state necessary to access information about a particular + * mapping in a particular process. */ +struct pm_map { + pm_process_t *proc; + + unsigned long start; + unsigned long end; + unsigned long offset; + int flags; + + char *name; +}; + +/* Create a pm_kernel_t. */ +int pm_kernel_create(pm_kernel_t **ker_out); + +#define pm_kernel_pagesize(ker) ((ker)->pagesize) + +/* Get a list of probably-existing PIDs (returned through *pids_out). + * Length of the array (in sizeof(pid_t) units) is returned through *len. + * The array should be freed by the caller. */ +int pm_kernel_pids(pm_kernel_t *ker, pid_t **pids_out, size_t *len); + +/* Get the map count (from /proc/kpagecount) of a physical frame. + * The count is returned through *count_out. */ +int pm_kernel_count(pm_kernel_t *ker, unsigned long pfn, uint64_t *count_out); + +/* Get the page flags (from /proc/kpageflags) of a physical frame. + * The count is returned through *flags_out. */ +int pm_kernel_flags(pm_kernel_t *ker, unsigned long pfn, uint64_t *flags_out); + +#define PM_PAGE_LOCKED (1 << 0) +#define PM_PAGE_ERROR (1 << 1) +#define PM_PAGE_REFERENCED (1 << 2) +#define PM_PAGE_UPTODATE (1 << 3) +#define PM_PAGE_DIRTY (1 << 4) +#define PM_PAGE_LRU (1 << 5) +#define PM_PAGE_ACTIVE (1 << 6) +#define PM_PAGE_SLAB (1 << 7) +#define PM_PAGE_WRITEBACK (1 << 8) +#define PM_PAGE_RECLAIM (1 << 9) +#define PM_PAGE_BUDDY (1 << 10) + +/* Destroy a pm_kernel_t. */ +int pm_kernel_destroy(pm_kernel_t *ker); + +/* Get the PID of a pm_process_t. */ +#define pm_process_pid(proc) ((proc)->pid) + +/* Create a pm_process_t and returns it through *proc_out. + * Takes a pm_kernel_t, and the PID of the process. */ +int pm_process_create(pm_kernel_t *ker, pid_t pid, pm_process_t **proc_out); + +/* Get the total memory usage of a process and store in *usage_out. */ +int pm_process_usage(pm_process_t *proc, pm_memusage_t *usage_out); + +/* Get the working set of a process (if ws_out != NULL), and reset it + * (if reset != 0). */ +int pm_process_workingset(pm_process_t *proc, pm_memusage_t *ws_out, int reset); + +/* Get the PFNs corresponding to a range of virtual addresses. + * The array of PFNs is returned through *range_out, and the caller has the + * responsibility to free it. */ +int pm_process_pagemap_range(pm_process_t *proc, + unsigned long low, unsigned long hi, + uint64_t **range_out, size_t *len); + +#define _BITS(x, offset, bits) (((x) >> offset) & ((1LL << ((bits) + 1)) - 1)) + +#define PM_PAGEMAP_PRESENT(x) (_BITS(x, 63, 1)) +#define PM_PAGEMAP_SWAPPED(x) (!_BITS(x, 62, 1)) +#define PM_PAGEMAP_SHIFT(x) (_BITS(x, 55, 6)) +#define PM_PAGEMAP_PFN(x) (_BITS(x, 0, 55)) +#define PM_PAGEMAP_SWAP_OFFSET(x) (_BITS(x, 5, 50)) +#define PM_PAGEMAP_SWAP_TYPE(x) (_BITS(x, 0, 5)) + +/* Get the maps in the virtual address space of this process. + * Returns an array of pointers to pm_map_t through *maps. + * The array should be freed by the caller, but the maps should not be + * modified or destroyed. */ +int pm_process_maps(pm_process_t *proc, pm_map_t ***maps_out, size_t *len); + +/* Destroy a pm_process_t. */ +int pm_process_destroy(pm_process_t *proc); + +/* Get the name, flags, start/end address, or offset of a map. */ +#define pm_map_name(map) ((map)->name) +#define pm_map_flags(map) ((map)->flags) +#define PM_MAP_READ 1 +#define PM_MAP_WRITE 2 +#define PM_MAP_EXEC 4 +#define pm_map_start(map) ((map)->start) +#define pm_map_end(map) ((map)->end) +#define pm_map_offset(map) ((map)->offset) + +/* Get the PFNs of the pages in the virtual address space of this map. + * Array of PFNs is returned through *pagemap_out, and should be freed by the + * caller. */ +int pm_map_pagemap(pm_map_t *map, uint64_t **pagemap_out, size_t *len); + +/* Get the memory usage of this map alone. */ +int pm_map_usage(pm_map_t *map, pm_memusage_t *usage_out); + +/* Get the working set of this map alone. */ +int pm_map_workingset(pm_map_t *map, pm_memusage_t *ws_out); + +#endif diff --git a/libpagemap/pm_kernel.c b/libpagemap/pm_kernel.c new file mode 100644 index 00000000..3615f1ac --- /dev/null +++ b/libpagemap/pm_kernel.c @@ -0,0 +1,158 @@ +/* + * Copyright (C) 2008 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#include <dirent.h> +#include <errno.h> +#include <fcntl.h> +#include <stdint.h> +#include <stdlib.h> +#include <sys/stat.h> +#include <sys/types.h> +#include <unistd.h> + +#include <pagemap/pagemap.h> + +int pm_kernel_create(pm_kernel_t **ker_out) { + pm_kernel_t *ker; + int error; + + if (!ker_out) + return 1; + + ker = calloc(1, sizeof(*ker)); + if (!ker) + return errno; + + ker->kpagecount_fd = open("/proc/kpagecount", O_RDONLY); + if (ker->kpagecount_fd < 0) { + error = errno; + free(ker); + return error; + } + + ker->kpageflags_fd = open("/proc/kpageflags", O_RDONLY); + if (ker->kpageflags_fd < 0) { + error = errno; + close(ker->kpagecount_fd); + free(ker); + return error; + } + + ker->pagesize = getpagesize(); + + *ker_out = ker; + + return 0; +} + +#define INIT_PIDS 20 +int pm_kernel_pids(pm_kernel_t *ker, pid_t **pids_out, size_t *len) { + DIR *proc; + struct dirent *dir; + pid_t pid, *pids, *new_pids; + size_t pids_count, pids_size; + int error; + + proc = opendir("/proc"); + if (!proc) + return errno; + + pids = malloc(INIT_PIDS * sizeof(pid_t)); + if (!pids) { + closedir(proc); + return errno; + } + pids_count = 0; pids_size = INIT_PIDS; + + while ((dir = readdir(proc))) { + if (sscanf(dir->d_name, "%d", &pid) < 1) + continue; + + if (pids_count >= pids_size) { + new_pids = realloc(pids, 2 * pids_size * sizeof(pid_t)); + if (!new_pids) { + error = errno; + free(pids); + closedir(proc); + return error; + } + pids = new_pids; + pids_size = 2 * pids_size; + } + + pids[pids_count] = pid; + + pids_count++; + } + + closedir(proc); + + new_pids = realloc(pids, pids_count * sizeof(pid_t)); + if (!new_pids) { + error = errno; + free(pids); + return error; + } + + *pids_out = new_pids; + *len = pids_count; + + return 0; +} + +int pm_kernel_count(pm_kernel_t *ker, unsigned long pfn, uint64_t *count_out) { + off_t off; + + if (!ker || !count_out) + return -1; + + off = lseek(ker->kpagecount_fd, pfn * sizeof(uint64_t), SEEK_SET); + if (off == (off_t)-1) + return errno; + if (read(ker->kpagecount_fd, count_out, sizeof(uint64_t)) < + (ssize_t)sizeof(uint64_t)) + return errno; + + return 0; +} + +int pm_kernel_flags(pm_kernel_t *ker, unsigned long pfn, uint64_t *flags_out) { + off_t off; + + if (!ker || !flags_out) + return -1; + + off = lseek(ker->kpageflags_fd, pfn * sizeof(uint64_t), SEEK_SET); + if (off == (off_t)-1) + return errno; + if (read(ker->kpageflags_fd, flags_out, sizeof(uint64_t)) < + (ssize_t)sizeof(uint64_t)) + return errno; + + return 0; +} + +int pm_kernel_destroy(pm_kernel_t *ker) { + if (!ker) + return -1; + + close(ker->kpagecount_fd); + close(ker->kpageflags_fd); + + free(ker); + + return 0; +} diff --git a/libpagemap/pm_map.c b/libpagemap/pm_map.c new file mode 100644 index 00000000..f683ba6c --- /dev/null +++ b/libpagemap/pm_map.c @@ -0,0 +1,125 @@ +/* + * Copyright (C) 2008 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#include <stdlib.h> +#include <string.h> + +#include <pagemap/pagemap.h> + +int pm_map_pagemap(pm_map_t *map, uint64_t **pagemap_out, size_t *len) { + if (!map) + return -1; + + return pm_process_pagemap_range(map->proc, map->start, map->end, + pagemap_out, len); +} + +int pm_map_usage(pm_map_t *map, pm_memusage_t *usage_out) { + uint64_t *pagemap; + size_t len, i; + uint64_t count; + pm_memusage_t usage; + int error; + + if (!map || !usage_out) + return -1; + + error = pm_map_pagemap(map, &pagemap, &len); + if (error) return error; + + pm_memusage_zero(&usage); + + for (i = 0; i < len; i++) { + if (!PM_PAGEMAP_PRESENT(pagemap[i]) || + PM_PAGEMAP_SWAPPED(pagemap[i])) + continue; + + error = pm_kernel_count(map->proc->ker, PM_PAGEMAP_PFN(pagemap[i]), + &count); + if (error) goto out; + + usage.vss += map->proc->ker->pagesize; + usage.rss += (count >= 1) ? (map->proc->ker->pagesize) : (0); + usage.pss += (count >= 1) ? (map->proc->ker->pagesize / count) : (0); + usage.uss += (count == 1) ? (map->proc->ker->pagesize) : (0); + } + + memcpy(usage_out, &usage, sizeof(usage)); + + error = 0; + +out: + free(pagemap); + + return error; +} + +int pm_map_workingset(pm_map_t *map, pm_memusage_t *ws_out) { + uint64_t *pagemap; + size_t len, i; + uint64_t count, flags; + pm_memusage_t ws; + int error; + + if (!map || !ws_out) + return -1; + + error = pm_map_pagemap(map, &pagemap, &len); + if (error) return error; + + pm_memusage_zero(&ws); + + for (i = 0; i < len; i++) { + if (!PM_PAGEMAP_PRESENT(pagemap[i]) || + PM_PAGEMAP_SWAPPED(pagemap[i])) + continue; + + error = pm_kernel_flags(map->proc->ker, PM_PAGEMAP_PFN(pagemap[i]), + &flags); + if (error) goto out; + + if (!(flags & PM_PAGE_REFERENCED)) + continue; + + error = pm_kernel_count(map->proc->ker, PM_PAGEMAP_PFN(pagemap[i]), + &count); + if (error) goto out; + + ws.vss += map->proc->ker->pagesize; + ws.rss += (count >= 1) ? (map->proc->ker->pagesize) : (0); + ws.pss += (count >= 1) ? (map->proc->ker->pagesize / count) : (0); + ws.uss += (count == 1) ? (map->proc->ker->pagesize) : (0); + } + + memcpy(ws_out, &ws, sizeof(ws)); + + error = 0; + +out: + free(pagemap); + + return 0; +} + +int pm_map_destroy(pm_map_t *map) { + if (!map) + return -1; + + free(map->name); + free(map); + + return 0; +} diff --git a/libpagemap/pm_map.h b/libpagemap/pm_map.h new file mode 100644 index 00000000..08dc4485 --- /dev/null +++ b/libpagemap/pm_map.h @@ -0,0 +1,24 @@ +/* + * Copyright (C) 2008 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#ifndef _LIBS_PAGEMAP_PM_MAP_H +#define _LIBS_PAGEMAP_PM_MAP_H + +#include <pagemap/pagemap.h> + +int pm_map_destroy(pm_map_t *map); + +#endif diff --git a/libpagemap/pm_memusage.c b/libpagemap/pm_memusage.c new file mode 100644 index 00000000..9c5db92e --- /dev/null +++ b/libpagemap/pm_memusage.c @@ -0,0 +1,28 @@ +/* + * Copyright (C) 2008 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#include <pagemap/pagemap.h> + +void pm_memusage_zero(pm_memusage_t *mu) { + mu->vss = mu->rss = mu->pss = mu->uss = 0; +} + +void pm_memusage_add(pm_memusage_t *a, pm_memusage_t *b) { + a->vss += b->vss; + a->rss += b->rss; + a->pss += b->pss; + a->uss += b->uss; +} diff --git a/libpagemap/pm_process.c b/libpagemap/pm_process.c new file mode 100644 index 00000000..1ab367d8 --- /dev/null +++ b/libpagemap/pm_process.c @@ -0,0 +1,290 @@ +/* + * Copyright (C) 2008 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#include <errno.h> +#include <fcntl.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#include <pagemap/pagemap.h> + +#include "pm_map.h" + +static int read_maps(pm_process_t *proc); + +#define MAX_FILENAME 64 + +int pm_process_create(pm_kernel_t *ker, pid_t pid, pm_process_t **proc_out) { + pm_process_t *proc; + char filename[MAX_FILENAME]; + int error; + + if (!ker || !proc_out) + return -1; + + proc = calloc(1, sizeof(*proc)); + if (!proc) + return errno; + + proc->ker = ker; + proc->pid = pid; + + error = snprintf(filename, MAX_FILENAME, "/proc/%d/pagemap", pid); + if (error < 0 || error >= MAX_FILENAME) { + error = (error < 0) ? (errno) : (-1); + free(proc); + return error; + } + + proc->pagemap_fd = open(filename, O_RDONLY); + if (proc->pagemap_fd < 0) { + error = errno; + free(proc); + return error; + } + + error = read_maps(proc); + if (error) { + free(proc); + return error; + } + + *proc_out = proc; + + return 0; +} + +int pm_process_usage(pm_process_t *proc, pm_memusage_t *usage_out) { + pm_memusage_t usage, map_usage; + int error; + int i; + + if (!proc || !usage_out) + return -1; + + pm_memusage_zero(&usage); + + for (i = 0; i < proc->num_maps; i++) { + error = pm_map_usage(proc->maps[i], &map_usage); + if (error) return error; + + pm_memusage_add(&usage, &map_usage); + } + + memcpy(usage_out, &usage, sizeof(pm_memusage_t)); + + return 0; +} + +int pm_process_pagemap_range(pm_process_t *proc, + unsigned long low, unsigned long high, + uint64_t **range_out, size_t *len) { + int firstpage, numpages; + uint64_t *range; + off_t off; + int error; + + if (!proc || (low >= high) || !range_out || !len) + return -1; + + firstpage = low / proc->ker->pagesize; + numpages = (high - low) / proc->ker->pagesize; + + range = malloc(numpages * sizeof(uint64_t)); + if (!range) + return errno; + + off = lseek(proc->pagemap_fd, firstpage * sizeof(uint64_t), SEEK_SET); + if (off == (off_t)-1) { + error = errno; + free(range); + return error; + } + error = read(proc->pagemap_fd, (char*)range, numpages * sizeof(uint64_t)); + if (error < numpages * sizeof(uint64_t)) { + error = (error < 0) ? errno : -1; + free(range); + return error; + } + + *range_out = range; + *len = numpages; + + return 0; +} + +int pm_process_maps(pm_process_t *proc, pm_map_t ***maps_out, size_t *len) { + pm_map_t **maps; + + if (!proc || !maps_out || !len) + return -1; + + if (proc->num_maps) { + maps = malloc(proc->num_maps * sizeof(pm_map_t*)); + if (!maps) + return errno; + + memcpy(maps, proc->maps, proc->num_maps * sizeof(pm_map_t*)); + + *maps_out = maps; + } else { + *maps_out = NULL; + } + *len = proc->num_maps; + + return 0; +} + +int pm_process_workingset(pm_process_t *proc, + pm_memusage_t *ws_out, int reset) { + pm_memusage_t ws, map_ws; + char filename[MAX_FILENAME]; + int fd; + int i, j; + int error; + + if (!proc) + return -1; + + if (ws_out) { + pm_memusage_zero(&ws); + for (i = 0; i < proc->num_maps; i++) { + error = pm_map_workingset(proc->maps[i], &map_ws); + if (error) return error; + + pm_memusage_add(&ws, &map_ws); + } + + memcpy(ws_out, &ws, sizeof(ws)); + } + + if (reset) { + error = snprintf(filename, MAX_FILENAME, "/proc/%d/clear_refs", + proc->pid); + if (error < 0 || error >= MAX_FILENAME) { + return (error < 0) ? (errno) : (-1); + } + + fd = open(filename, O_WRONLY); + if (fd < 0) + return errno; + + write(fd, "1\n", strlen("1\n")); + + close(fd); + } + + return 0; +} + +int pm_process_destroy(pm_process_t *proc) { + if (!proc) + return -1; + + free(proc->maps); + close(proc->pagemap_fd); + free(proc); + + return 0; +} + +#define INITIAL_MAPS 10 +#define MAX_LINE 256 +#define MAX_PERMS 5 + +/* + * #define FOO 123 + * S(FOO) => "123" + */ +#define _S(n) #n +#define S(n) _S(n) + +static int read_maps(pm_process_t *proc) { + char filename[MAX_FILENAME]; + char line[MAX_LINE], name[MAX_LINE], perms[MAX_PERMS]; + FILE *maps_f; + pm_map_t *map, **maps, **new_maps; + int maps_count, maps_size; + int error; + + if (!proc) + return -1; + + maps = calloc(INITIAL_MAPS, sizeof(pm_map_t*)); + if (!maps) + return errno; + maps_count = 0; maps_size = INITIAL_MAPS; + + error = snprintf(filename, MAX_FILENAME, "/proc/%d/maps", proc->pid); + if (error < 0 || error >= MAX_FILENAME) + return (error < 0) ? (errno) : (-1); + + maps_f = fopen(filename, "r"); + if (!maps_f) + return errno; + + while (fgets(line, MAX_LINE, maps_f)) { + if (maps_count >= maps_size) { + new_maps = realloc(maps, 2 * maps_size * sizeof(pm_map_t*)); + if (!new_maps) { + error = errno; + free(maps); + fclose(maps_f); + return error; + } + maps = new_maps; + maps_size *= 2; + } + + maps[maps_count] = map = calloc(1, sizeof(*map)); + + map->proc = proc; + + sscanf(line, "%lx-%lx %s %lx %*s %*d %" S(MAX_LINE) "s", + &map->start, &map->end, perms, &map->offset, name); + + map->name = malloc(strlen(name) + 1); + if (!map->name) { + error = errno; + for (; maps_count > 0; maps_count--) + pm_map_destroy(maps[maps_count]); + free(maps); + return error; + } + strcpy(map->name, name); + if (perms[0] == 'r') map->flags |= PM_MAP_READ; + if (perms[1] == 'w') map->flags |= PM_MAP_WRITE; + if (perms[2] == 'x') map->flags |= PM_MAP_EXEC; + + maps_count++; + } + + fclose(maps_f); + + new_maps = realloc(maps, maps_count * sizeof(pm_map_t*)); + if (maps_count && !new_maps) { + error = errno; + free(maps); + return error; + } + + proc->maps = new_maps; + proc->num_maps = maps_count; + + return 0; +} |